重點(diǎn)講解：
1. engage in
參與；從事；
eg. Faculty who engage in research seem to have more knowledge to pass on to their students.
從事研究工作的教師似乎有更多的學(xué)識可以傳授給學(xué)生。
eg. So we have to be very cautious of you know what kind of activities we engage in.
所以我們對參加哪種集體活動都會謹(jǐn)慎的考慮。
2. be dedicated to sth./doing sth.
奉獻(xiàn)給；獻(xiàn)身于；致力于；
eg. He was a consultant physician, a serious man dedicated to his calling.
他是個會診醫(yī)生，嚴(yán)肅認(rèn)真，對自己的職業(yè)全身心投入。
eg. Health products company dedicated to innovative research and development.
公司致力于健康產(chǎn)品的創(chuàng)新研發(fā)。
3. in vain
徒勞；白費(fèi)力氣；
eg. It became obvious that all her complaints were in vain.
很明顯她所有的抱怨都是白費(fèi)口舌。
eg. The thief tried in vain to open the locked door.
小偷試圖把鎖著的門打開，但枉費(fèi)心機(jī)。