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。