be up to sba. used to say that someone can decide about something由某人决定:•You can pay weekly or monthly – it's up to you.你可以每周或者每月付一次款，你自己决定。b. used to say that someone is responsible for a particular duty是某人的义务:•It's up to the travel companies to warn customers of any possible dangers.旅游公司有义务预先告知游客任何可能的危险。be up to sbto be sb's duty or responsibility; to be for sb to decide是…的职责（或责任）；由…决定It's not up to you to tell me how to do my job.还轮不到你来告诉我怎么做我的事。Shall we eat out or stay in? It's up to you.咱们是到外面吃饭还是待在家里？你决定吧。 |