短語詞組短語plod on 沉重地向前plod tread 走的詞根plod 2 賴氨酸羥化酶基因snow plod 輕而易舉登上雪山flit plod 迅速飛過plod detail 努力用功Plod Away At One 's Work 胼手胝足plod one 's weary way detail 長途困頓 返回 plod