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.
自从这个发现以来，研究者们也发现月球上有大量的水源。
Since this discovery, researchers also found that the moon has an abundance of water.
自从这个发现以来，研究者们也发现月球上有大量的水源。
Since this discovery, researchers also found that the moon has an abundance of water.
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