I tried to reach him, but the line was engaged.

我试过联系他，但电话占线。

《柯林斯英汉双解大词典》

I keep dialing, but the line seems dead.

我一直在拨号，但线路似乎断了。

youdao

I tried to call him, but the line was busy.

我试过打电话给他，但电话占线。

youdao

The sun had barely risen, but the line outside of the Apple store in Bethesda,Maryland already stretched around the block.

VOA: standard.2010.04.03

But the line I wrote down out of that piece was this.

不过除了那部分我还记下了这几句

耶鲁公开课 - 美国内战与重建课程节选

It ultimately evaluates that line of code but just once the stuff inside the curly braces, but the semicolon on the end, essentially has the effect of this.

它最终执行了那行代码,但是只有一次，当那个东西在花括号里，分号放在后面，本质上影响了这个循环。

哈佛公开课 - 计算机科学课程节选

The concert will be televised, but the line-up of performers has yet to be announced.

BBC: Derby date and holidays mark Queen's Diamond Jubilee

No train passengers were hurt in the collision but the line remained closed until the afternoon.

BBC: Barriers 'held down longer' in Somerset rail crash

But the line between too little and too much government involvement is a thin one.

CNN: FIGHTING 'GODZILLAS'