descent

descent
noun
  1. [usu. in sing.]an action of moving downwards, dropping, or falling
    下降,下落
    the plane had gone into a steep descent.
    飞机陡然下降。
    ■a downward slope, especially a path or track
    坡道
    a steep, badly eroded descent.
    陡峭而且已被严重侵蚀的坡道。
    ■a moral, social, or psychological decline into a specified undesirable state
    没落; 堕落
    the ancient empire's slow descent into barbarism.
    古代帝国慢慢没落至野蛮状态的过程。
  2. [mass noun]the origin or background of a person in terms of family or nationality
    血统,家世,门第
    most of the settlers were of Cornish descent.
    大多数移民都来自康沃尔地方。
    ■the transmission of qualities, property, or privileges by inheritance
    世袭;遗传
  3. (descent on)a sudden violent attack
    突袭
    a descent on the Channel ports.
    突袭英吉利海峡诸港。
    ■an unexpected visit, especially an unwelcome one
    突然来到,突然访问
语源
  1. Middle English: from Old French descente, from descendre 'to descend' (see descend)
英语宝典
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