[机] 萃取柱

extraction column的用法和样例：

例句

The column is surmounted by a statue.柱顶上树立了一尊雕像。
The structure and surface property of packing have distinct effect on packed bubble extraction columns.填料的结构与表面性能对鼓泡填料萃取塔性能有直接影响。

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