在拿不准的情况下，你最好通过其它渠道和好友进行联络确认。
If you're unsure, try to contact them through another channel and see if the link is legit.
内置的对讲系统能让无绳电话听筒之间或与基站之间进行联络。
A built-in intercom system lets handsets communicate with the other or the base station.
他命令他的士兵们不要使用手机进行联络，以步话机取而代之。
He told his soldiers to stop using their mobiles and go back to walkie-talkies.
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