Buying a second-hand car can be very tricky. You really have to have your wits about you.买二手车可能会上当，你真得留点神。Be careful when you talk to the boss. He got up on the wrong side of the bed this morning.和老板说话可要留点神，他今早一直都心情不好。Come on, now. Get with it.来吧。留点神。He's got the needle with you. You've got to go very careful.你惹他火了，你得多留点神。