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。

youdao

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。

youdao

Double layers of ventilated and three-dimensional protection design, not only fit the baby's legs but also effectively avoid side leaking.

双层立体防漏设计，紧贴宝宝腿部，提供双重防侧漏效果，宝宝再好动也不怕。

youdao

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