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groupgroup英英釋意

      group

      英 [gru?p] 美[ɡrup]
      • n. 組;團(tuán)體
      • adj. 群的;團(tuán)體的
      • vi. 聚合
      • vt. 把…聚集;把…分組

      英英釋意


      1. any number of entities (members) considered as a unit
      2. (chemistry) two or more atoms bound together as a single unit and forming part of a molecule
      3. a set that is closed, associative, has an identity element and every element has an inverse