名词
中文翻译：三重物
同义词：
['terrestrial mass', 'tri-mass例句：1. The terrestrial planets are the four largest planets in our solar system.（地行星是我们太阳系中最大的四个行星。）']
例句：
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1. The terrestrial planets are the four largest planets in our solar system.
地行星是我们太阳系中最大的四个行星。
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2. The terrestrial planets are composed mainly of rock and metal.
地行星主要由岩石和金属组成。
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3.The terrestrial planets are the only ones that have liquid water on their surfaces.
地行星是唯一一个表面有液态水的行星。