plaything consisting of a toy clown that jumps out of a box when the lid is opened
jack-in-the-box详细解释
jack-in-the-box n.（名词）【复数】jack-in-the-box.es 或 jacks-in-the-box [j2ks.-] A toy consisting of a clownlike puppet that springs out of a box when the lid is activated.玩偶匣：当盖子被揭开时，盒子里面象小丑一样的木偶就会跳起来的玩具
