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臺灣籍旅美老師今天交給我們的句子是：
With gravity, happy to pull its center of mass even more off balance. And the more off balance, it is the more gravity pulls in too! Physicist calls this kind of tipping an... Inverted Pendulum.
因為地心引力的關系，一失去重心就會倒下，重心越傾斜，地心引力的作用就越強烈，物理學家稱這種現象為 倒單擺作用。
