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tracheatrachea英英釋意

      trachea

      英 [tr?'ki??; 'tre?k??] 美['trek??]
      • n. [脊椎][解剖] 氣管;[植] 導(dǎo)管

      英英釋意


      1. membranous tube with cartilaginous rings that conveys inhaled air from the larynx to the bronchi
      2. one of the tubules forming the respiratory system of most insects and many arachnids