研究者们长期以来都在争执月球表面是否有水——比如朦胧的环形山中冻结的水分。

Researchers have long argued over whether the moon contains water on its surface - frozen in shadowy craters, for instance.

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许多研究者现在都认同了月球含有少量水分，他说道，但是“在与地球和火星等其他行星体相比仍然属于非常干燥的范畴”。

Many researchers now agree that the moon contains some water, he says, but it's "still very dry in comparison to other planetary bodies, like Earth and Mars."

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实际上，研究者们将那些“球”送到月球又使它们返回。

In effect, researchers are sending balls all the way to the moon and back.

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