当用户回答时，便意味着到用户的电话线路已经建立，并且开始计费。

When the subscriber begins to answer, the telephone link to the subscriber has been established and the charging period comes into effect.

youdao

当用户回答时，便意味着到用户的电话线路已经建立，并且开始计费。

When the subscriber begins to answer, the telephone link to the subscriber has been established and the charging period comes into effect.

youdao