His work is a reminder that the laser-which celebrated its 50th birthday last year and is already used in medicine for various kinds of surgery-still has plenty of tricks up its sleeve.
去年是激光被发现的50周年纪念，如今它已经被应用于各种手术器械，此时此刻bornhop博士的努力提醒了世界，激光还有许多秘技。
He took his children to the zoo and saw various kinds of animals last week.
上周他带他的孩子们去动物园看了许多动物。
Over the last 40 years, Europe went quite far on the road to integrate by overcoming various kinds of difficulties.
在过去的40余年时间里，欧洲人克服了重重困难，在一体化的道路上取得了重大进展。
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