动词过去式:expended 过去分词:expended 现在分词:expending 第三人称单数:expends
pend,pens＝to hang（悬挂）,to weigh（衡量）
v [Tn, Tn.pr] ~ sth (on/upon sth/doing sth) (fml 文)
1 spend, use (money, etc) in doing sth 花费, 使用（钱等）做某事
*expend time, effort and money on a project 在一项目上花费时间、精力和金钱.
2 use (sth) up; exhaust 用光（某物）; 耗尽
*expend all one's ammunition, stores, fuel 用尽所有的弹药、储备、燃料.
[Date: 1400-1500; Language: Latin;Origin: expendere 'to weigh out, pay', from pendere 'to weigh']
to use or spend a lot of energy etc in order to do something
expend energy/effort/time/resources etc
People of different ages expend different amounts of energy.
Manufacturers have expended a lot of time and effort trying to improve computer security.
expend sth in/on (doing) sth
A great deal of time and money has been expended on creating a pleasant office atmosphere.