例如，基于广义相对论，科学家们认为暗物质的存在是因为宇宙物体的运转表明似乎它们有比我们能观测到更大的质量。
Based on general relativity, for example, scientists think dark matter exists because some cosmic objects behave as if they have more mass than we can see.
毫无疑问，太阳系所有的行星将围绕木星运转，因为在太阳系的行星中木星的质量最大。
There can be no doubt that they would all begin to revolve around Jupiter, because that planet has the largest mass.
一个健康的身体和一个运转良好的大脑，能使我们拥有一个高质量的生活。
A well-functioning brain in a healthy body enables us to have the best quality of life.
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