Kevlar
noun [ U ] trademark uk/ˈkev.lɑːr/ us/ˈkev.lɑːr/
凯夫拉纤维（一种非常强韧且耐高温的人造纤维）
a brand name for a very strong artificial material that is not damaged by high temperatures
Helmets and bulletproof vests are often made out of Kevlar. 头盔和防弹背心通常由凯夫拉纤维制成。