名词
中文翻译：Unknown
同义词：
['vector', 'centripetal force', 'centripetal motion']
例句：
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1. The vector of the Earth's gravity is approximately 9.8m/s^2.
地球的重力矢量大约是9.8 m/s^2。
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2. The centripetal force keeps the spacecraft from spinning out of control.
向心力使宇宙飞船不至于失控旋转。
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3. The centripetal motion of the planets around the sun is responsible for their orbits.
行星围绕太阳的向心运动决定了它们的轨道。