大约400年前，伽利略·伽利雷证明了这一原理。
This principle was famously demonstrated by Galileo Galilei some 400 years ago.
文艺复兴时期，尼古拉·哥白尼，约翰尼斯·开普勒和伽利略·伽利雷等人的伟大思想展现了科学研究和发现的力量。
During the Renaissance, the great minds of Nicolaus Copernicus, Johannes Kepler and Galileo Galilei demonstrated the power of scientific study and discovery.
这一法则是在大约400年前，由伽利略•伽利雷那个著名的比萨斜塔实验所证明的，当时他在塔顶同时释放球型炮弹和毛瑟枪子弹，以及由金、银、木头制成的小球。
This principle was famously demonstrated by Galileo Galilei some 400 years ago when he simultaneously dropped cannon and musket balls, and balls made of gold, silver and wood, from the Tower of Pisa.
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