Definition
A situation in which something bad or dangerous almost happened.
指差一点发生不好的事情。
He almost missed his flight; it was a close thing.
他差点错过了他的航班；真是千钧一发。
The car swerved at the last moment, or it would have hit the pedestrian. It was a close thing.
汽车在最后一刻急转弯，否则就会撞到行人。真是千钧一发。
I crammed for the exam at the last minute, but I still passed. It was a close thing.
我在最后一刻临时抱佛脚，但还是通过了考试。真是千钧一发。