Make a mountain out of a molehill:
一座小丘說(shuō)成一座山 ×
小題(tí)大做 √
例句：
She shouted at him angrily for being five minutes late, but she really made a mountain out of a molehill.
因爲他遲(chí)到瞭(le)五分鍾，她很生氣地對他大喊。她真是小題大做。
Break one's back:
背都打碎 ×
非常辛苦地工作 √
例句：
Working as a consultant in this company will break your back.
在這間(jiān)咨詢(xún)公司上班非常辛苦。
Back the wrong horse:
支持錯(cuò)的馬(mǎ) ×
押錯(cuò)寶(bǎo)，選錯(cuò)人 √
例句：
He rarely backs the wrong horse when it comes to investing in stocks.
他在炒股票時(shí)很少看走眼。
