短語(yǔ)詞組短語(yǔ)secondary xylem differentiation 次生木質(zhì)部分化differentiation of secondary xylem 次生木質(zhì)部分化secondary xylem vessel 次生木質(zhì)部導(dǎo)secondary xylem anatomy 次生木質(zhì)部解剖 返回 secondary xylem