Definition: If a tire is flat, it does not contain enough air. Level: B2
当我到车那里时，我发现轮胎没气了。
When I got to the car, I discovered I had a ___flat tire.
傍晚时我的轮胎没气了，导致我看演出迟到了。
I got a ___flat tire in the evening and was late for the show.
自行车的轮胎没气了，所以我需要打气。
The bicycle has a ___flat tire, so I need to pump it up.
