[] a task or project, especially one that is important and/or difficult 任务；事业◆To build a website to handle their worldwide sales was no small undertaking. 建立一个处理全球销售业务的网站不是一件小事。⨁an enormous / a considerable / huge / major / massive undertaking 巨大的／重要的／大的／重大的／大规模的任务
[] a business 企业◆Why do they keep pouring money into a failing commercial undertaking? 他们为甚麽不停地往一个失败的商业项目中投入资金？
[, ]an agreement or a promise to do sth 承诺；保证◆The company gave a written undertaking to compensate customers if there were serious delays. 这家公司作出书面承诺，如果出现重大延误，将赔偿顾客损失。⨁to renege on / break / give / honour an undertaking 违背／违反／作出／兑现诺言