The three different structures are veneer-way reinforced, hard-shell-type and sandwich.

这三种结构分别为单板双向加筋、硬壳式和夹层式。

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The three different structures are veneer-way reinforced, hard-shell-type and sandwich.

这三种结构分别为单板双向加筋、硬壳式和夹层式。

youdao