Upwards of a billion stars in our galaxy have burnt up their internal energy sources, and so can no longer produce the heat a star needs to oppose the inward force of gravity.

在我们的星系中，超过10亿颗恒星已经耗尽了它们的内部能量来源，因此无法再产生恒星所需的热量来对抗向内的引力。

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Walking keeps you upright and enlists gravity to keep acids from splashing up the esophagus.

散步可以帮助你直立和获得地心重力的作用，去防止胃酸上溅到食道上。

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Tom looked up in her face with just a perceptible twinkle peeping through his gravity.

汤姆抬起头来，看着她的脸，严肃地眨了眨眼睛。

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Imagine waking up every morning and saying to yourself: "I refuse to accept the law of gravity.

想象每天早上醒来后对自己说：,“我拒绝接受万有引力定律。

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Imagine if an aeronautics engineer : woke up in the morning and said, "you know,the Law of Gravity thing really makes things difficult for me.

试想一下，如果一个航空工程师,在早上醒来，说，“万有引力,真的带给我很多麻烦。

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"By having more weight, the center of gravity goes up, " making the boat less stable, said Lt.

WSJ: Boat Operators Struggle With Heavier Load

At Oort-cloud distances, the strength of this combined gravity adds up to the same sort of force as that exerted by the solar gravitational field, enfeebled as it is by its remoteness from the sun.

ECONOMIST: X marks the spot

Encouraged by the wind, it defies gravity and flows up the gentle incline toward the trees.

NPR: Excerpt: 'Woodsburner'