[体]挂膝回环下

the penny drops───恍然大悟，豁然开朗

penny cress───菥蓂

penny stock───便士股票，低价股

pigeon drop───鸽子降落

body drop───尸体坠落

knee drop───跪落

lemon drop───柠檬糖

So for me, the penny did not drop until Wednesday morning that the world now belongs to the generation below mine.───因此，对我而言，直到17日那个早晨我才肯相信，世界如今已经属于我的下一代了。

trouble, he says, is that whereas the English wait deadpan for the penny to drop, Germans invariably explain their punch line.───但是，问题是，英国人会面无表情地等硬币落下来而德国人则认为很有笑点。

If a penny drop out of my pocket? One may not ignore it.───当一个硬币从我的口袋里掉出来时，一般人都不会忽略。

the penny-drop that broke her arm.───那个曾经打破她胳膊的游戏机。