preserve (v.) 保护、保藏例句：Deep freezing is the simplest way of preserving food.深冻是保藏食品最简便的方法。Queen's English(King's English) 标准英语例句： She can speak the Queen's English fluently.她能说一口流利的标准英语。What time is convenient for you?你什么时候方便？ 对话：A: Mike, I'd like to talk to you. What time is convenient for you? B: Sometime next week.A：Mike, 我想和你谈谈。你什么时候方便？ B：下个星期的某个时候吧。