常見(jiàn)例句用作名詞 (n.)In damaged stems and roots, and in those undergoing secondary growth, it is replaced by a secondary layer, the periderm.已損傷的莖和根，以及進(jìn)行次生生長(zhǎng)的根莖中，表皮被次生層即周皮代替。 返回 periderm