以下为句子列表：
英文: Electrons are kept in their paths by the force of attraction between the protons and the electrons.
中文: 质子与电子间的吸引力使电子保持在他们的轨道上。
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英文: The natural force of attraction exerted by a celestial body, such as Earth, upon objects at or near its surface, tending to draw them toward the center of the body.
中文: 重力天体如地球，所施加的自然吸引力，如地球，对处于或接近其表面的物体有将它们拉向其中心的趋势
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