单词 pet-cock 释义 pet-cock[app. f. pet n.1 or ? n.3 + cock n.1 12.]A small plug-cock fastened in a pipe or cylinder, as in a pump or a steam-engine, for purposes of draining or testing.1864in Webster.1875in Knight Dict. Mech. 1672/2. 1888 Hasluck Model...