拼音：ch ù j í fā
解释：一触动弓弩上的扳机，箭就发出去。后指触动某一点，就立即发作或有所反应。多用于感情方面。也作“触机便发”。
单字解释： 触 机 即 发
As soon as the trigger on the crossbow is touched, the arrow goes out. Touch or react immediately after a certain point. Mostly used in emotional aspects. Also known as "hair on the trigger".
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