con·ser·van·cy /kənˈsɝvən(t)si/
保存,保護,管理
Con·serv·an·cy n. Conservation, as from injury, defilement, or irregular use.
[An act was] passed in 1866, for vesting in the Conservators of the River Thames the conservancy of the Thames and Isis. --Mozley & W.
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conservancy
n 1: a commission with jurisdiction over fisheries and navigation
in a port or river
2: the official conservation of trees and soil and rivers etc.