Preaching to the choir: 多此一举The politician was wasting his breath explaining his policies at his party's rallies. He was just preaching to the choir.Sonia preached to the choir when she complained about relatives her kids disliked too.There is no point lecturing women about the problems of domestic violence. You are preaching to the choir since perpetrators are usually men.Definition: To make one's case primarily to one's supporters.Etymology: The members of the "choir" play the music, while those in the "chorus" sing along. While a preacher's job is to change (convert) the non-believers into believers ("the converted").******Elephant in the room: 敏感话题 心知肚明却避而不谈的问题Ellen and her parents wanted to talk about the elephant in the room when they found out she was pregnant.After smelling Eva's foot odour, Bill could not take it anymore and decided to talk about the elephant in the room.When Sara returned from Korea with double eye lids, a pointy nose and a sharper chin, her friends refused to talk about the elephant in the room.Definition: An obvious truth that is being ignored or unaddressed. Or a problem no one wants to discuss.Etymology: First used to question British schoolboys in 1915. with the question "Is there an elephant in the classroom". Because it is an idea that an elephant in the room would be impossible to ignore.******Second fiddle: 二流 副手 次要地位 B角 Ronaldo left the football club after being sick of playing second fiddle to Messi.Ivan played second fiddle at the radio station to the more experienced Jonas.Leo's anxiety problems forced him to play second fiddle in the airplane cockpit.Definition: To be in a subordinate position to someone.Etymology: This term alludes to the part of the second violin in an orchestra. Although many would argue it is as important as the first violin, it is the idea of subordinacy that became a metaphor in 1800.