单词：geocentre
geocentre的用法和样例：
例句
- Height is a measurement at right angles to this surface, and though gravity pulls mainly toward the centre of the earth, the geocentre, there are local variations.高程是一个垂直于这个表面的测度，而虽然重力总是将物体向地心方向拉，但局部总会有一些变化。
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