the quality or condition of being useful; usefulness功用: function; usage; effect; use效用: effectiveness; efficacy; eff ...效用: effectiveness; efficacy; efficiency; utility; usefulness; avail 边际效用 [经济] marginal utility 功能；功用: function功用块: function block下载手机词典可随时随地查词查翻译关注微信公众号：chachacidian，回复:功用，效用，即可在微信中查询翻译
