If the caller will have to wait for a long time, you must offer to take a message.

如果打电话的人不得不等很长时间，你必须提供留口信的服务。

youdao

If the caller will have to wait for a long time, you must offer to take a message.

如果打电话的人不得不等很长时间，你必须提供留口信的服务。

youdao