电话号码升位的英文：
upgrade telephone number

Companies need to upgrade servers.
公司需要对服务器升级。

He was upgraded to security guard.
他被擢升为保安。

The first is upgrading our infrastructure.
首先，我们要改善我们的基础设施。

Receptionists'telephones are always engaged.
接待员的电话总是占线。

I have to make a telephone call.
我必须打个电话。

I telephoned to thank her.
我打电话向她道谢。

The number was fifty.
该数字为五十。

There is safety in numbers
人多势众

It was an irrational number.
这是一个无理数。