一组NASA资助的研究人员正在用激光射束击月球的方法，检验等量原理。
A group of NASA-supported researchers are going to test the Equivalence Principle by shooting laser beams at the Moon.
一组NASA资助的研究人员正在用激光射束击月球的方法，检验等量原理。
A group of NASA-supported researchers are going to test the Equivalence Principle by shooting laser beams at the Moon.
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