老师：请你跟老师说话时叫先生，这样比较有礼貌。
Teacher: Always say "Sir," please, when you are speaking to an elder. It's more polite.
老师：请你跟老师说话时叫先生，这样比较有礼貌。
Teacher: Always say 'Sir' please, when you are speaking to master. It's more polite.
而且，最好在一开始就告诉旁边的人你在等电话，这样做比较有礼貌。
It is polite to inform others at the beginning that you are expecting an important call.
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