名词
中文翻译：地球
同义词：
['ground', 'groundwork', 'grounding']
例句：
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1. The earth is round and has a diameter of about 6,371 kilometers.
地球是圆的，直径约为6,371公里。
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2. The scientists are studying the earth's core to learn more about its structure.
科学家们正在研究地球的核心，以了解其结构。
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3. The earth's gravity pulls us down to the surface.
地球的重力将我们拉向地面。