网上科普有关“科普英语的内容?”话题很是火热，小编也是针对科普英语的内容?寻找了一些与之相关的一些信息进行分析，如果能碰巧解决你现在面临的问题，希望能够帮助到您。
暗银河系的发现及其科学意义
In addition to conventional galaxies, the universe contains very dim galaxies that until recently went unnoticed by astronomers. Possibly as numerous as conventional galaxies, these galaxies have the same general shape and even the same approximate number of stars as a common type of conventional galaxy, the spiral, but tend to be much larger. Because these galaxies ’mass is spread out over larger areas, they have far fewer stars per unit volume than do conventional galaxies. Apparently these low-surface-brightness galaxies, as they are called, take much longer than conventional galaxies to condense their primordial gas and convert it to stars—that is, they evolve much more slowly.
These galaxies may constitute an answer to the long-standing puzzle of the missing
baryonic mass in the universe. Baryons—subatomic particles亚原子粒子 that are generally protons or neutrons—are the source of stellar, and therefore galactic, luminosity, and so their numbers can be estimated based on how luminous galaxies are. However, the amount of helium in the universe, as measured by spectroscopy光谱学, suggests that there are far more baryons in the universe than estimates based on galactic luminosity indicate. Astronomers have long speculated that the missing baryonic mass might eventually
be discovered in intergalactic space星系际的空间 or as some large population of galaxies that are difficult to detect.
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另类海豹哺乳方式与众不同
Until recently, zoologists believed that all species of phocids (true seals), a pinnipped family, use a different maternal strategy than do otariids (fur seals and
sea lions), another pinniped family. Mother otariids use a foraging strategy. They acquire moderate energy stores in the form of blubber before arriving at breeding sites and then fast for 5 to 11 days after birth. Throughout the rest of the lactation (milk production) period, which lasts from 4 months to 3 years depending on the species, mother otariids alternately forage at sea, where they replenish their fat stores, and nurse their young at breeding sites. Zoologists had assumed that females of all phocids species, by contrast,
use a fasting strategy in which mother phocids, having accumulated large energy
stores before they arrive at breeding sites, fast throughout the entire lactation period, which lasts from 4 to 50 days depending on the species. However, recent studies on
harbor seals, a phocids species, found that lactating females commenced foraging
approximately 6 days after giving birth and on average made 7 foraging trips during the remainder of their 24-day lactation period.
The maternal strategy evolved by harbor seals may have to do with their small size and the large proportion of their fat stores depleted in lactation. Harbor seals are small compared with other phocids species such as grey seals, all of which are known to fast for the entire lactation period. Studies show that mother seals of these species use respectively 84 percent, 58 percent, and 33 percent of their fat stores during lactation. By comparison, harbor seals use 80 percent of their fat stores in just the first 19 days of lactation, even though they occasionally feed during this period. Since such a large proportion of their fat stores is exhausted despite feeding, mother harbor seals clearly cannot support all of lactation using only energy stored before giving birth. Though smaller
than many other phocids, harbor seals are similar in size to most otariids. In addition,
there is already some evidence suggesting that the ringed seal, a phocids species that
is similar in size to the harbor seal, may also use a maternal foraging strategy.
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pheromones是什么东东，是不是该划为odorant
There is no consensus among researchers regarding what qualifies a substance as a pheromone. While most agree on a basic definition of pheromones as chemicals released by one individual of a species which, when detected by another individual of the same species, elicit a specific behavioral or physiological response, some researchers also specify that the response to pheromones must be unconscious. In addition, the distinction
between pheromones and odorants—chemicals that are consciously detected as odors---can be blurry, and some researchers classify pheromones as atype of odorant. Evidence that pheromone responses may not involve conscious odor perception comes from the finding that in many species, pheromones are processed by the vomeronasal (or accessory olfactory) system, which uses a special structure in the nose, the vomeronasal organ (VNO),to receive chemical signals. The neural connections between the VNO and the brain are separate from those of the main olfactory system, whose processing of
odorants triggers sensations of smell. But while the VNO does process many animal
pheromone signals, not all animal pheromones work through the VNO. Conversely,
not all chemical signals transmitted via the VNO quality as pheromones. For example,
garter snakes detect a chemical signal from earthworms—one of their favorite foods—via
the VNO, and they use this signal to track their prey.
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好像是科普文章，但后面两句有点难度。以下翻译杜绝机译。翻译准确，达意，请放心。
(1) The milestone which marked the beginning of the modern age of computers was the development of the
transistors.This device was significantly smaller than the electronic tubes,requied much less electrical power to operate,and generated very much less heat.With the subsequent development circuits,it became possible to design equipment consisting of hundreds and thousands of transistors but requiring minimal space.
（1）标志现代计算机时代到来的里程碑是晶体管的开发成功。这种器件比电子管小得多，工作所需的电功率也少得多，而且产生的热量也少得多。随着其后晶体管电路的发展，设计由成百上千个晶体管组成而只需要很小空间的设备成为了可能。
(2) To most people,the invention of the transistors meant portabie radios.But to those in the data processing business,it significant the start of the second generation of computers.
（2）对大多数人来说，晶体管的发明意味着袖珍收音机。但对从事数据处理业务的人来说，他的意义在于第二代计算机的开始。
(3) Significant innovations spurred by intense competition have resulted in enormous increases in computer performance and substantial reductions in price.This trend,established with the introduction of second-generation computers.continues today...
（3）由激烈的竞争所激励起来的重大发明已经导致计算机性能的巨大提升和价格的实质性下降。今天，这一由第二代计算机的采用所确立起来的趋势还在继续……
(4) This advance has made computers with amazing speed and impressive capability commonplace.
（4）这一进展已使具有惊人速度和令人印象深刻的能力的计算机成为寻常的东西。
(5) The result is that with a CAD/CAM system engineers and designers can view complex forms from various angles at the push of a utton instead of having to construct costly,time-consuming models and mock-ups.Changes can be made quickly and inexpensively at the keyboard without requiring drawing changes or modification of a physical model. In addition,the display can produce realistic simulatios of product operation before any hardware is actually produced.
（5）其结果是，借助于CAD/CAM（计算机辅助设计/计算机辅助制造），系统工程师和设计师只要按一下按钮，就可以从各种不同的角度观察复杂的形态，而无需费钱的建设和费时的模型和制作。改变可以在键盘上迅速而便宜地做出，而无需改变图纸或修改物理模型。此外，显示器还能在硬件生产出来之前，显示出产品工作状况的实际模拟过程。
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本文概览：网上科普有关“科普英语的内容?”话题很是火热，小编也是针对科普英语的内容?寻找了一些与之相关的一些信息进行分析，如果能碰巧解决你现在面临的问题，希望能够帮助到您。暗银河系的发现...