基本解释
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
英语解释
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".
