Must (noun)

　　●Something that is necessary.

　　（必須做的事，必需品）

　　Examples:　　

　　1.If you live in the country a car is a must.　　

　　2.You know that brushing your teeth twice a day and flossing at least once daily are musts.

　　Show one's hand (idiom)

　　●To allow people to know about intentions that you had previously kept secret.

（攤牌，亮底，表明意圖）

　　Examples:　　

　　1.If you want to get a raise, don't show the boss your hand too soon.　　

　　2.In negotiations, never show your hand too early.

　　Play for time (idiom)

　　●To delay until you are ready.（為爭取時間而拖延）

Examples:　　

　　1.We can't sign the agreement yet - we'll have to play for time.　　

　　2.My computer crashed just as the meeting began, so I had to play for time while I waited for it to reboot.

　　A false alarm (idiom)

　　●A warning of something, especially something unpleasant or dangerous, which does not in fact happen.（假警報，誤警）

　　Examples:　　

　　1.They thought the packet contained a bomb but it was a false alarm.　　

　　2.Three fire engines rushed to the school only to discover it was a false alarm.

　　Take sb in (phrasal verb)

　　●To trick someone into believing something that is not true

　　Examples:　　

　　1.Don't be taken in by their promises.　　

　　2.That alleged fundraiser took me in completely.