chip in = contribute money捐献，集资

　　two thumbs up 举双手赞成

　　be the apple of one's eye = be very precious to sb 非常珍贵

　　pull one's leg = tease someone 开某人玩笑

　　break one's back 辛勤工作

　　go for a song = be sold very cheaply 贱卖

　　bucket down = rain very heavily 瓢泼大雨

　　backroom boys 幕后英雄

　　below the mark = not measure up 不够水平，不合格

　　at one's finger's tips 了如指掌

　　at sixes and sevens 混乱的

　　backseat driver 指手划脚的人

　　break the ice 打破僵局;打破沉默

　　bring down the house 掌声雷动

　　burn a hole in one's pocket 花钱如流水