jack-in-the-box怎么读

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jack-in-the-box英语什么意思：n. (pl jack-in-the-boxes, jacks-in-the-box) 1.(打开盖子即有玩偶跳起的)玩偶匣。 2.(能放出多种玩意的)盒子焰火。 3.【机械工程】差动齿轮[装置]。