Once ductility is introduced, materials become weak.
而一旦把延展性引入进来，材料就变得脆弱了。
It is evident that ductility is a desirable property of structural materials required to resist blast.
显然，为要抵抗爆震，结构材料的延性是一个重要的条件。
Plastic materials should take into account its ductility, unscreened thermoplastic deformation.
塑料材料要考虑到其延展性、热塑变形等。
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