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1·I can't get an outside line.

我接不通外线。《牛津词典》

2·How do I get an outside line?

我怎么才能打外线？

3·Can I make calls on outside line?

电话恐怕您不能打外线。

4·Can I make calls on outside line?

我可以打外线吗？

5·Ask the switchboard operator for an outside line.

叫(电话)接线员接外线。

6·Sorry, it's our house phone, not for outside line.

对不起，这是工作电话，不外借。

7·Yes, thank you. What do I dial for an outside line?

是的，谢谢。打外线需要先拨什么？

8·Dial 9 for an outside line, and then the number you are calling.

打外线时先拨9，然后再拨电话号码。

9·Did you dial zero? You need to dial zero first to get an outside line.

你没拨“零”吧，打外线要先拨“零”，要不然打不出去。

10·This is the operator. You have an outside line. May I put it through ?

这里是总机，您有一个外线电话，介意我接入您的房间吗？