1. While he chatted with other tourists, I exchanged polite conversation in the dark with a man seated in front of me, a Belgian who spoke fluent English.
    他跟其他游客聊着天，我则在黑暗中礼貌地跟一位坐在我前面的男士谈话。他是位比利时人，讲一口流利的英语。

2. Traffic police are sometimes very polite.
    交通警察有时很有礼貌。

3. Traffic police are sometimes very polite.
    交通警有时也很客气。

4. His polite manners bespoke the gentleman.
    他那彬彬有礼的举止显出他是个绅士.