单词：middle position
middle position的用法和样例：
例句
- This is because the DME is the symmetry elements, and the carbon-oxygen bond in the middle position.这是因为二甲醚是对称性分子，而且碳氧键处于中间位置。
- The middle position of all the adjusting parts suggest that the instrument has achieved levelness.仪器安平时，其各调整部位均应处中间位置。
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