The lateral walls, and the partitions are folded twice to have double layers, increasing their firmness and robustness.

将侧壁和分隔板折叠两次，以使其具有双层，从而增加其稳固性和坚牢性。

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By using separating cores, double layers of castings in one mold can be produced, and the productivity can be increased obviously.

采用分隔砂芯，可在一个铸型内制作两层铸件，明显提高了生产率。

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This article presents the principle, configuration and characteristics of floating-bed ion exchanger with double Chambers and double layers.

叙述了双室双层浮动床离子交换器的原理、结构及特点。

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Alternatively, it could be that no one has been looking for two layers, so they have not seen the double signature or have ignored its significance.

ECONOMIST: Mass extinctions