相关单词同义词helpful, beneficial, advantageous, conducive, assistant, 近义词 advantageous, beneficial, helpful反义词useless临近词useless, used, usefully, useful at, useful in, useful to, usefulness, useful map, useful top, useful for, useful time, useful work相似词use sth up, use your head idiom, use your loaf idiom, used, useful idiot, usefully, usefulness, useless, 返回 useful