percussion cap

基本解释

His attempts to find a safe way to handle nitroglycerin resulted in the invention of dynamite and the blasting cap.
他试图找到一种处理硝化甘油的安全方法，结果发明了黄色炸药和雷管。
We shall start the two blocks from rest at the center point of the track and force them apart by exploding the cap with an electric spark.
开始时，将两个滑块静止置放在槽的中心，然后利用电火花引爆雷管，迫使它们分开。

a detonator consisting of a paper or thin metal cap containing material that explodes when struck and formerly used in certain firearms