dam

dam1
abbreviation for
  1. decametre(s)
    同 decametre 或 decametres
dam2
noun
  1. a barrier, typically of concrete, constructed to hold back water and raise its level, the resulting reservoir being used in the generation of electricity or as a water supply
    水坝
    ■(chiefly S. African)an artificial pond or reservoir where rain or spring water is collected for storage
    (主 南非)水库
    ■a barrier of branches in a stream, constructed by a beaver to provide a deep pool and a lodge
    （海狸筑起的）坝
    ■(chiefly N. Amer.)a rubber sheet used to keep saliva from the teeth during dental operations
    (主 北美)（牙科手术中的）橡皮障
(dammed, damming)
  1. [with obj.]build a dam across (a river or lake)
    在（河，湖）上筑坝
    ■hold back or obstruct (something)
    阻止；抑制；阻碍
    the closed lock gates dammed up the canal.
    关闭的闸门将运河阻断。
语源
  1. Middle English: from Middle Low German or Middle Dutch; related to Dutch dam and German Damm, also to Old English fordemman 'close up'
dam3
noun
  1. the female parent of an animal, especially a domestic mammal
    （尤指家养的）母畜，母兽
语源
  1. late Middle English (denoting a human mother): alteration of dame
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