1.vary in…在…方面不同vary from…to…从…到…变化vary with随着…而变化,因…而不同
2．involve sb in…允许某人参与involve oneself in…积极参与be/get involved in…被卷入到….之中
3.more than surprised 十分/非常 吃惊more …than…与其说…不如说…(强调前者)
4.on guard (保持)警惕;值班,站岗on holiday度假on leave休班on duty值班
5.do sb a favour 帮某人一个忙ask sb a favour请某人帮个忙
in favour of 赞成do sb a favor = do a favor for sb帮某人的忙