常見例句用作名詞 (n.)In vascular plants, the xylem and phloem serve to translocate such substances.維管植物的木質(zhì)部和韌皮部主要進(jìn)行對這類物質(zhì)進(jìn)行運(yùn)輸。The secondary phloem consisted of sieve cells and phloem parenchymas.根的次生韌皮部則由篩胞和韌皮薄壁細(xì)胞組成。 返回 phloem