Dial when you hear dialing sound after you pick the phone up.

将手柄从话机上向上提起后摘机，听到拨号音后即拨号。

youdao

Dial when you hear dialing sound after you pick the phone up.

将手柄从话机上向上提起后摘机，听到拨号音后即拨号。

youdao