1.Go in one ear and out the other 一只耳朵进一只耳朵出
例句：

Mom: Jack, do your homework!
妈妈：杰克，做作业去！
Jack: Ok... On my way...(continue to play cell phone)
杰克：好的……这就去……（继续玩手机）
Mom: Do it now! Don\'t go in one ear and out the other.
妈妈：现在就去！你是不是耳朵不进油盐？

2.Play it by ear. 随机行事

例句：
a: Do you wanna go shopping tonight？or go to see a movie? or go to Chinatown?
a: 晚上想不想去逛街？或者看电影？或者去唐人街？
b: We have plenty of time. Let\'s just play it by ear, and see how we feel at night.
b: 既然咱时间有的是，那就见机行事吧，到时候再看。