be useful to和be useful for的区别?

be useful to和be useful for的区别 be useful to和be useful for的区别? 是be useful for 还是be useful to? be useful for=什么? be useful to的中文解释 be useful for sb.对…有好处; be useful to sb.对某人有用; 请问be useful for sb是不是短语 these ways seem to be useful To be useful（句子开头）怎译? be useful是什么意思 be more useful是什么意思 Some men seek office,not to be useful to the state,but for t