invest /inˈvest/ vt. & vi. 投资；把时间用在…: I have invested (all) my money in cotton. 我把我(所有)的钱都投资到棉花上去了。Everyone should invest some time in community service. 每个人都应在社区服务方面投入一些时间。
investment /inˈvestmənt/ n. ［c］ 投资，投资额；可投资的东西：The industry has large investments of capital. 该工业得到大量投资。Getting an education is a wise investment of time and money. 受教育是时间与金钱的明智的投资。
investor /inˈvestə/ n. [c]投资者，投资人：the need to restore investor confidence恢复投资者信心的需要The investor believes that his investment will pay off handsomely soon.这个投资者相信他的投资不久会有相当大的收益。
