短語詞組短語Planetary gear drive mechanism [機]行星齒輪傳動機構(gòu)Planet gear drive mechanism 微型行星齒輪減速器harmonic gear drive mechanism [機]諧波齒輪傳動機構(gòu)NGW planetary gear drive mechanism NGW 型行星齒輪傳動機構(gòu) 返回 drive gear mechanism