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1. The theory of general relativity explains the behavior of gravity in space and time.
广义相对论理论解释了空间和时间中引力的行为。
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2. During the Big Bang, the universe was expanding rapidly due to the force of gravity.
在大爆炸期间,由于引力的作用,宇宙正在迅速扩张。
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3. The collapse of a star can lead to the formation of a neutron star or black hole.
一颗恒星的坍塌可以导致中子星或黑洞的形成。