fuze

The museum's old artillery shell still has its original fuze, but it is no longer dangerous.

博物馆里的那枚旧炮弹仍保留着原来的引信，但已经不再危险。

Before the test launch, the engineer checked the fuze to make sure it would ignite the rocket propellant at the right moment.

试射前，工程师检查了引信，以确保它在正确的时刻点燃火箭推进剂。

The soldiers carefully attached new fuzes to the practice grenades before the drill.

士兵们在演习前小心翼翼地把新引信装到练习手榴弹上。