It's going to rain, because the dark clouds are gathering and hanging lower and lower.
就要下雨了，因为乌云密布，而且越压越低了。
Rather, they are dark because of interstellar dust that hides the stars behind it.
相反，它们之所以是黑暗的，是因为星际尘埃将恒星隐藏在它的后面。
The tugboat is small and dark and it's making a lot of smoke, but it's very strong, because it's pulling the much bigger ship.
拖船又小又黑，还冒着很多烟，但它非常有力，因为它在拖着比它更大的船。
Normally planes don't go to the polar post from February to October because of the dangers of flying in the pitch-dark and cold.
通常情况下，飞机不会在2月到次年10月之间经行极地，因为在漆黑、寒冷的天气下飞行是很危险的。
Maybe it was because he was listening to the radio, but he didn't notice the dark object in the road until it was too late.
可能是因为当时他正在听收音机，所以当他注意到路上黑乎乎的东西时已经来不及了。
The store, Wuguan Books, is known as an "experimental bookstore" because of the dark lighting used to show the books on sale.
这家名为“无关书店”的书店被称为“实验书店”，因为它在展示出售的书籍时使用了昏暗的灯光。
And many outdoor areas that people would prefer to be bright at night remain dark because of the expense.
再说还有很多人们希望在晚间照亮的室外区域因为成本的缘故而不得不陷入黑暗的包围。
Many of them burn wood, waste and dung indoors for heating and cooking. The soot released into the air as a consequence is also a climate-changer because, being dark, it absorbs heat.
很多农民通过燃烧木头、垃圾和粪便来取暖、烧饭，排放到大气中的煤烟因为是黑色而吸热同样会造成气候变化。
Havana's once elegant seafront promenade, the Malecon, is now often dark at night because of lack of street lighting.
而由于路灯关闭，哈瓦那一度繁华的海滨大道马雷贡夜间也经常漆黑一片。
That's because they use a model of dark matter that decays into certain types of particles such as heavy quarks and travels at the same speed no matter what the temperature is.
由于他们采用的暗物质模型只能衰退为诸如重夸克这样的特定粒子，并且运行速度平稳，未受温度影响。
This is something that had never been seen up to now because the painting was always judged to be dark and difficult to examine," he told a news conference.
之前，我们从未发现过这层薄沙，因为人们一直认为这幅画色调暗，不易探查。
This is something that had never been seen up to now because the painting was always judged to be dark and difficult to examine, "he told a news conference."
之前，我们从未发现过这层薄沙，因为人们一直认为这幅画色调暗，不易探查。
We find that the amount of your L/C is insufficient, because the premiums for Dark and Special colors are not included therein. Therefore, please increase the amount of the L/C to $56, 800.00.
我们发现由于信用证金额未包括深特色加价，因此信用证金额不足，请将信用证金额增至$56，800.00。
The researchers said the inclusion of dark matter is likely crucial to their results, because theory predicts that galaxies sit inside larger spheres, called halos, of the invisible stuff.
研究人员们表示暗物质究竟包含什么对于他们的结果起着非常关键的作用，因为根据他们的理论，星系位于更大的球状结构——星系晕的包围之中，而星系晕是由不可见物质构成。
Because hydrogen atoms trap light, the young universe entered its "dark ages."
由于氢原子阻拦光线，年轻的宇宙进入了“黑暗时期”。
About five light-years "tall", the dark cloud is cataloged as Barnard 33 and is visible only because its obscuring dust is silhouetted against the glowing red emission nebula IC 434.
约5光年高的暗星云编号为巴纳德33，能够被看见仅仅因为其暗尘埃在明亮的发射星云IC 434的衬托下显出轮廓。
Gaga, who has dark hair in the clip, failed to win - because after 12 minutes she lost her temper and swore at her server.
Gaga在视频里还是黑色的头发，她没能赢得这场比赛——因为她忍了12分钟还是对服务生发起脾气来。
Oh, it's not because I don't have the right angle-it's because it's dark.
不是角度问题。是因为太暗了。
Dark energy makes up three-quarters of our Universe but is totally invisible. We only know it exists because of its effect on the expansion of the Universe.
暗能量占据了我们宇宙的四分之三，然而又是完全看不见的。我们只能根据它对宇宙膨胀所起的作用来认识到它的存在。
The belt of vegetation that crosses Africa below the Sahara is very dark because most of the sunlight is absorbed by plants for photosynthesis.
在撒哈拉沙漠下方，横贯非洲中部的植被带颜色非常深，因为植物由于光合作用吸收了大多数太阳光。
Galaxy clusters like MACS 1206 are perfect laboratories for studying dark matter's gravitational effects because they are the most massive structures in the universe.
像MACS 1206这种星系团是研究暗物质的引力效应的绝佳实验室，因为它们有宇宙中最大规模的结构。
Dark areas appear black rather than dark grey because the relevant cells are simply switched off.
黑暗区域显示的是黑色而不是深灰色，因为相关的单元格只是被关闭了。
Such research, he concluded, "sheds a new light on dinosaurs…which is handy because a lot of them were running around in the dark!
他总结说，这类研究“为恐龙的研究开辟了新路，让研究豁然开朗。而在过去，很多恐龙‘只能在黑暗中四处奔跑’。”
That's because we tend to time our blinks so that we don't get left in the dark.
那是因为我们倾向于选择合适的时机来眨眼，这样我们就不会错过很重要的事情。
You can't be merely taking the teenager's perspective as she swims in the dark, because she is cheerful, and you are terrified.
她在黑暗中向前游的时候，你不可能单纯以一个青少年的视角来看，因为她情绪很高，而你却恐惧。
Oil slicks are notoriously difficult to spot in natural-color (photo-like) satellite imagery because a thin sheen of oil only slightly darkens the already dark blue background of the ocean.
浮油出名的难以被发现在天然色卫星图像上，因为稀薄光泽的石油仅仅略黑于深蓝色的大海。
Oil slicks are notoriously difficult to spot in natural-color (photo-like) satellite imagery because a thin sheen of oil only slightly darkens the already dark blue background of the ocean.
浮油出名的难以被发现在天然色卫星图像上，因为稀薄光泽的石油仅仅略黑于深蓝色的大海。
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