占线

rú guǒ nǐ tīng dào cháng de bì bì shēng nà shuō míng zhàn xiàn

如果你听到长的哔哔声，那说明占线。

If you hear long bleeps, the line is busy.

wǒ yǐ qián gěi nǐ dǎ guo diàn huà dàn shì zhàn xiàn

我以前给你打过电话，但是占线。

I tried you earlier, but your phone was engaged.

jīn tiān xià wǔ wǒ gěi nǐ dǎ le sān cì diàn huà nǐ de shǒu jī yī zhí zhàn xiàn

今天下午我给你打了三次电话，你的手机一直占线。

I called you three times this afternoon and it's been busy all the time.

zhàn xiàn xìn hào

占线信号

engaged signal

bù lùn nǐ shén me shí hou dǎ diàn huà tā de diàn huà dōu zhàn xiàn

不论你什么时候打电话，他的电话都占线。

You will find his telephone busy whenever you call.