中文字幕精品视频在线|中文字幕在线观看|亚洲v日本v欧美v在线播放|伊人网中文字幕

<nav id="3u6n6"></nav><samp id="3u6n6"><tr id="3u6n6"><track id="3u6n6"></track></tr></samp>
    <legend id="3u6n6"><fieldset id="3u6n6"></fieldset></legend>

      
      

    1. 首頁英語詞典cambiumcambium英英釋意

      cambium

      英 ['k?mb??m] 美['k?mb??m]
      • n. [植] 形成層;新生組織

      英英釋意


      1. formative one-cell-thick layer of tissue between xylem and phloem in most vascular plants that is responsible for secondary growth
      2. the inner layer of the periosteum