The mother bee neatly folds in the inner layer of petals, smears a paper-thin mud layer and then folds the outer petals.
母蜂先把最里面那层花瓣整齐地弯曲折叠起来，抹一层纸张厚的泥巴，再然后把外边那层花瓣也叠起来。
The structure of pipe is thin inner plastic layer and thick outer plastic layer, easy to join with hot-melt pipe fitting.
生产的管材结构为内塑层薄外塑层厚，以利于与热熔管件连接；
Preferable vessel is comprised of stainless steel, having a thin, continuous, uniform layer of 235u integrally bonded to its inner walls.
不锈钢靶容器的内表面薄薄地镀一层铀，镀层应牢固而均匀。
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