肺细胞约每周新老更替一次。Lung cells die and are replaced about once a week.昼夜更替.Day and night alternate.从事高等教育的人员新老更替极其缓慢。There has been very little renewal of personnel in higher education....
If he demands too much, the unions will vote him down.如果他要求太多，工会就会投票撤换他。The once-powerful post unions have been cut down to size.一度很强势的邮政联盟已经威风不再。They have yet to break the link with the trade unions.他们还必须断绝与工会组织的联系。...
牢记我们对祖国应尽的义务.Never forget our duty to our motherland.你有义务照顾她. responsibility指 “由于法律、职业或道德等的要求而应尽的责任”,含有 “ 法津上对后果负责任”的意味,如:You're under obligation to care her.这是我应尽的责任,不用谢!Don't thank me for doing my duty!...
As a player he was unselfish, a true team man.作为一名选手，他毫无私念，真正把自己摆在团队中。His playing as a trumpet player was quite revolutionary.他的小号演奏独创一格。She can hold her own against almost any player.她几乎能和任何一名选手一较高下。...
a matter of especial importance特别重要的事情The authorities took especial interest in him because of his trade union work.因为他在工会工作，官方对他特别感兴趣。He was Maybelle Merriwether's especial beau , Rene Picard.他是梅贝尔-梅里韦瑟的昵友, 名叫雷内-皮卡...