是be useful for 还是be useful to?

是be useful for 还是be useful to? be useful to和be useful for的区别 be useful to和be useful for的区别? be useful for=什么? 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 be useful to的中文解释 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