夜幕降临的时候我参观了这个陨石坑，我深深地明白，太阳系的碎片随时可能侵入我们舒适的地球和月球构成的环境。
I visited the crater as night fell, and I felt keenly aware that fragments of the solar system can invade our cozy realm of Earth and Moon.
关于月亮构成的数据，比如它含有多少冰和其他宝藏，有助于中国决定未来的月球基地计划是否可行。
Data about the moon's composition, such as how much ice and other treasures it contains, could help China decide whether its plans for a future lunar base are practical.
我们预料，但是我们不能确定，月球有一个由熔岩构成的地核，如同地球。
We think-but we are not sure-that the moon has a center core which includes molten rock, as the earth does.
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