A double edged sword 双刃剑Don't hate people; it is a double edged sword.Having a high IQ is a double edged sword since no one is compatible to talk to you.Being in a position of power is a double edged sword since people can no longer treat you like a friend.Definition: Something that has both pros and cons.Etymology: First used in the 15th century. ***双刃剑Success/fame is a double edged sword. It's a life fulfilling experience that causes you to lose friends afterwards. 成功或成名是双刃剑.朋友会越来越少.Losing weight in a short amount of time is a double edged sword, sometimes it will affect one's health and reduce immunity.迅速减肥是双刃剑,有时会影响健康,降低免疫力.XXXXXXXXXXXXXXXXXDoesn't ring a bellThe name of the famous classical musician doesn't ring a bell with Tom since he only listens to modern music.I have met Dana, but her name doesn't ring a bell.When Jeff's girlfriend talked about a girl from work, Jeff claimed the girl's name did not ring a bell. This was to conceal the fact it was his ex.Definition: To awaken a memoryEtymology: To ring a bell or "awaken a memory" is perhaps a reference to Pavlovian experiments. In a series of experiments, Pavlov then tried to figure out how these phenomena were linked. For example, he struck a bell when the dogs were fed. If the bell was sounded in close association with their meal, the dogs learned to associate the sound of the bell with food. After a while, at the mere sound of the bell, they responded by drooling.***想不起来 没有印象Her cousin told her that when she was little, she wanted everybody to call her princess. She was a little embarrassed and claimed that it didn't ring a bell to her. 她没有印象!He said we'd met on many different occasions and yet he didn't ring a bell to me. He still seems like a total stranger to me! 他说我们过去见过很多次,但我想不起来了,对我来说他就是个陌生人.