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. unknown

      英 [?n'n??n] 美[,?n'non]
      • adj. 未知的;陌生的,默默無(wú)聞的
      • n. 未知數(shù);未知的事物,默默無(wú)聞的人

      英英釋意


      1. an unknown and unexplored region;
      "they came like angels out the unknown"
      2. anyone who does not belong in the environment in which they are found
      3. a variable whose values are solutions of an equation