1.flop （表演、电影等）不卖座，失败 (来源：英语麦当劳－英语杂志 http://www.EnglishCN.com)

     The movie was a flop. Nobody went to see it.

     这部电影卖座率奇低，没有人去看。

     2.drop in/by/over 随时造访

     Feel free to drop in anytime. I'm usually home and I'd love the company.

     欢迎随时来坐坐。我通常在家，也喜欢游人做伴。

     3.drop a line 写信

     Drop me a line! 给我写信！

     4.duck 躲闪，突然低下头

     Remind little Bobby to duck his head when he crawls under the table so he won't hit his head.

     提醒小波比爬到桌下时要低头才不会受伤。

     5.go with the flow 随从大家的意见

     Sharon is an easy-going person. She just goes with the flow.

     沙伦是个随和的人。人家怎么说，她就怎么做。