他的突然离职对团队来说就像一颗手榴弹，打乱了所有计划。
His sudden resignation was like a ___grenade that blew up all our plans.
警察在训练中学习如何安全投掷手榴弹。
The officers practiced how to safely throw ___grenades during their training.
消防员向火源投掷灭火弹以控制火势。
The firefighter threw a ___grenade at the fire source to contain the flames.
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