cav·al·ry /ˈkævəlri, &dɪvɪdɛ;ˈkælvəri/
  騎兵
  Cav·al·ry n.  Mil. That part of military force which serves on horseback.
  Note: ☞ Heavy cavalry and light cavalry are so distinguished by the character of their armament, and by the size of the men and horses.
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  cavalry
       n 1: troops trained to fight on horseback; "500 horse led the
            attack" [syn: horse cavalry, horse]
       2: a highly mobile army unit