从属性上讲，拨号可以保证相对安全性，因为特定的电话线可以确认用户的身份。
In the subordinate says, the digit dialing may guarantee the relative security, because the specific telephone line may confirm the user the status.
从属性上讲，拨号可以保证相对安全性，因为特定的电话线可以确认用户的身份。
In the subordinate says, the digit dialing may guarantee the relative security, because the specific telephone line may confirm the user the status.
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