[] 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?他们为什么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transfer of undertaking