11. teach fish to swim：班门弄斧
Teaching him how to speak English is teaching fish to swim.
教他学英语的方法简直就是班门弄斧。
12. early bird ：早起不睡懒觉的，勤奋的，吃苦耐劳的The early bird catches the worm; you have to get up early in the morning so you can have more time to read
早起的鸟儿有虫吃，每天应该早起才会有更多时间读书。
13. cat and dog life：争吵不休的生活
Sam and his wife lead a cat and dog life together - they are always quarrelling with each other.
山姆和他的妻子在生活中争吵不休，他们每时每刻都在吵架。
14. cold fish：态度冷淡的人，无情的人
We know nothing about the new student in our class; he is a bit of a cold fish.
我们对那个新来的学生一无所知，他有点冷漠。
15. scape goat：替罪羔羊
The criminal tries to find a scapegoat for the crime he was committed of.
这个罪犯试图寻找一个替罪羔羊来掩饰他所犯下的罪行.
