Traffic was heavy and cars were closing up behind each other.

交通拥挤不堪，汽车一辆紧挨一辆地前行。

Don't use cold water as it shocks the blood vessels into closing up.

不要用冷水，因为冷水会刺激血管，使之闭合。

Sorry, we're closing up for lunch.

很抱歉，我们现在要关门吃午饭。

His wound is closing up.

他的伤口正在愈合。

Sorry madam, we're closing up for lunch.

很抱歉，小姐，现在要关门吃饭。