equire:[often passive](rather formal)to make sb.do or have sth,especially because it is necessary according to a law or set of rules or standard指要求做（某事）,达到（某水平）,尤指根据法律或规定 request（正式或礼貌的）要求,请求 demand :to ask for sth.very firmly；to say very firmly that sb.should have or do sth.指强烈要求,坚决要
