薄层结构超声测厚过程中，薄层上下界面回波叠加导致信号难以区分。
It is difficult to recognize the overlapping signal of the front and bottom echoes from the thin layer structure.
通过对“初始”薄层结构和等离子体条件的选择，在不同聚合物表面可形成多种纳米结构。
By choosing thin initial layers and variable plasma conditions, a broad range of nanostructures can be obtained on various polymers.
恒星的结构经常被想象成一系列套在一起的薄层，就像洋葱一样。
The structure of a star can often be thought of as a series of thin nested shells, somewhat like an onion.
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