door pump

名词 n.
中文释义

英文释义

名词 n.
  1. A hydraulic device attached to a door in its one end and to the doorframe in the other, performing one or more of the following functions: a) dampening the movements of the door, b) making sure that the door closes properly, and c) assisting in opening it.

词形变化

door pumps plural
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