三米高的自由落体实验我们做了无数次了。
伽利略曾在这个失去平衡的倾斜的钟楼上做过具有划时代意义的自由落体实验。
Galileo is said to have conducted his revolutionary experiments with falling objects from the off-kilter belfry.
本文简要阐述等效原理的研究背景，通过对自由落体法和扭秤法检验等效原理的详细介绍来具体讨论等效原理的实验检验。
The theoretical background of equivalence principle is briefly given, and the experimental tests of the equivalence principle is discussed in detail, via free-fall method and torsion balance.
本文简要阐述等效原理的研究背景，通过对自由落体法和扭秤法检验等效原理的详细介绍来具体讨论等效原理的实验检验。
The theoretical background of equivalence principle is briefly given, and the experimental tests of the equivalence principle is discussed in detail, via free-fall method and torsion balance.
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