久青草国产手机视频免费观看_毛片网站是多少_亚洲视频中文_一区二区高清在线

首頁英語詞典xylemxylem英英釋意

xylem

英 ['za?l?m] 美['za?l?m]
  • n. [植] 木質部

英英釋意

1. the woody part of plants: the supporting and water-conducting tissue, consisting primarily of tracheids and vessels