Let your heart rule your head 情感戰勝了理智,感情用事 act according to what you feel rather than what you think is sensible
Don't let your heart rule your head. I know you like him but are you sure you can really trust him? 不要感情用事.我知道你喜歡他,可是你能確定自己真的信任他嗎?
Let the genie out of the bottle: 把妖怪放出瓶子,引發災難性後果 do sth that causes a big and permanent change in perople's lives, especially one which might make a situation worse
Once you make carrying guns legal, you let the genie out of the bottle. 一旦擁有槍支被合法化,後果將不堪設想.
