中层, 介质层

stratum medium的用法和样例：

例句

There was a small middle stratum of semi-important officials evacuating with one family, a modicum of luggage, and a couple of trusted servants loaded on each cart.有一小部分中层官员和他们的家人一同撤离，带着些许家产和几个老家仆，坐在一辆架子车上。

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aerial archaeological discovery

alveoola

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arms embargo

asymmetric polymer synthesis