Semtex

noun

1. 塞姆汀塑胶炸药（常用于非法制造炸弹）
   a powerful explosive that is used for making bombs, often illegally

1. They need to inspect the metal for definitive signs of striation marks ( which would be consistent with chemical explosive, like Semtex, which they quickly discovered on the inside of the fuselage of Pan Am 103) and for the shape of the metal.
   他们要检查金属是否有确切的波纹痕迹（波纹痕迹意味着化学品爆炸，如塞姆汀炸药，当年调查人员在泛美103航班的机身内部很快就发现了这种炸药）以及金属机身的形状。