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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在传统锌基或铝基牺牲阳极的外面包覆一薄层镁基牺牲阳极制备成一种比较新颖的牺牲阳极——复合牺牲阳极。

By covering a thin layer of Mg anode onto the surface of traditional Zn anode orAl anode, a new kind of sacrificial anode-composite sacrificial anode was developed.

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研究发现，深厚黑土主要分布于黑土区北部，中厚与薄层黑土则分别集中在黑土区的中部和南部，这主要与黑土分布区的气候条件和黑土的成土过程有关。

It was found that the humus layer in black soil region was thick in north and thin in south, which was due to the climatic condition and soil-forming process.

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