Watch the moon to do a tree, hold the only moon in the sky, looking forward to the dawn.
做一棵看守月亮的树，守住天空中唯一的月亮，期待着黎明。
Titan was a major focus of the mission all along, since it's bigger than the planet Mercury and the only moon massive enough to have a significant atmosphere.
土卫六一直以来都是这项探测任务的主要聚焦点，因其体积比水星还要大，是唯一一颗拥有浓密大气层的卫星。
Finally, planetary scientists are eager to learn where Titan's nitrogen and methane originated and why it is the only moon in the solar system that possesses a dense atmosphere.
最后，行星科学家急于了解土卫六的氮气及甲烷从何而来，又为什么只有它是太阳系唯一拥有浓密大气的卫星。
The many gears not only moved in a way that could indicate the phases of the Moon.
这些齿轮的转动并不仅仅能显示出月相。
Moon Express is not the only company seeking for the right to travel to outer space.
月球快递并不是唯一一家寻求外太空旅行权利的公司。
Maybe the story is telling us if we don't look after the planet, a day will come when flowers can only grow on the moon.
也许这个故事告诉我们，如果我们不爱护这个星球，总有一天，花就只能在月球上生长。
If we don't look after our earth carefully, the day will come when flowers will only be able to grow on the moon.
如果我们不仔细照顾我们的地球，总有一天，花将只能在月球上生长。
The moon has to be very low in the sky—only 42 degrees from the horizon.
月亮必须在天空中很低的位置——与地平线只有42度。
As the Moon grew cooler and less elastic, rebound from large impactors would have been only partial and incomplete.
随着月球变得越来越冷，越来越没有弹性，来自大型冲击体的回弹变得不完整。
If you only send faxes once in a blue moon, do it from Staples or a copy shop.
如果您只发送传真一次在一蓝色的月亮，也从史泰博或复印店了。
The cloud gives all its gold to the departing sun and greets the rising moon with only a pale smile.
云霓将全部黄金倾付给西沉的落日，却仅以一抹淡淡的微笑向初升的月亮致意。
Moon only cover the central part of the sun, the sun also exposed a circle around the face, seems like a halo called on the Environment and Food.
月球只遮住太阳的中心部分，在太阳周围还露出一圈日面，好象一个光环似的叫日环食。
Unlike solar eclipses where the moon blocks the sun from our view in only a few locations on the planet, for lunar eclipses, as long as you can see the moon then you will see the eclipse.
与日食不同，当月亮遮挡太阳光时，在我们的视野里只有有限的位置可以供观看月食，就月食来说，只要你能看到月亮，就能看到它。
This is because only in that day, the moon will appear in the sun and the connection between the Earth, so will it be possible to block the sun and the moon formed the solar eclipse.
这是因为只有在那一天，月亮才会出现在太阳与地球之间的连线上，这样才有可能使月球挡住太阳而形成日食。
Artists could make their pictures better if they kept this in mind—only those parts of the moon which are lighted up by the sun are bright.
只有被太阳照射到的那些部分才是明亮的—如果美术家牢记这一点，也许能使他们的画画得更好。
For instance, a speculator may think of God as a snow bunny, or Elvis, or the man on the moon - whatever - but the only thing that really matters is who God really is - what matters is the truth.
例如，一个投机者可能认为上帝就是一个雪球，或艾维斯，或月亮上的某个人——不管是什么——但真正重要的是上帝到底是谁——真理是什么。
It took the Moon only twenty days to circle the Earth, and Earth's day was only eighteen hours long.
月球绕行地球一周只需二十天，地球的一天也只有十八小时长。
Partial solar eclipses happen when the moon blocks only part of the sun's disk, as seen from Earth, casting regions of the planet in shadow.
当月亮遮住部分太阳时，日偏食发生了，就像从地球上看到的一样，使得地球上的部分地区笼罩在阴影中。
Without the rocket, it is safe to say we would not only have never gone to the moon or visited every planet in our solar system.
没有了火箭，我们也就不可能到达月球或者任何一个太阳系的星球。
Dwyer and colleagues say this lunar dynamo could have operated in this way for at least a billion years, shutting down only when the Moon receded far enough from the Earth.
Dwyer和他的同事说，月球发电机可能以此种方式工作至少十亿年，只有当月球退离地球很远的时候工作才结束。
Behind Dione, hints of atmospheric banding can be seen on the North Pole of hazy Titan, the only known moon with a fully developed atmosphere.
在土卫四的背后，可以看到在模糊的土卫六北极上的大气带的迹象，土卫六是目前仅知的具有完全成熟大气层的卫星。
Taken 1, 200 miles from Helene, this is the closest photo ever taken of the minute moon, which measures only 20 miles across.
照片在距离土卫十二1200英里（约合1931公里）的地方拍摄，是迄今为止与这颗直径只有20英里（约合32公里）的小行星距离最近的一次拍摄。
Artists could make their pictures better if they kept this in mind - only those parts of the moon which are lighted up by the sun are bright.
如果画家们能记住这一点，即只有被太阳照射得发高的那部分月球是明亮的，那他们作起画来就会画得更好。
Despite persistent stories that it can be seen from the moon, the Great Wall is almost invisible from only 180 miles up!
尽管从月球上看到长城的故事耐人寻味，但是仅仅在180英里的高空几乎就看不见长城了！
It's important to plan the project, because once you're in front of the moon, it rises so quickly and you only have one chance to get the shots you want.
制定这个计划很重要，因为一旦你站在月亮前面，它上升得很快，你只有一次机会去拍摄你想要的照片。
It's important to plan the project, because once you're in front of the moon, it rises so quickly and you only have one chance to get the shots you want.
制定这个计划很重要，因为一旦你站在月亮前面，它上升得很快，你只有一次机会去拍摄你想要的照片。
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