| 释义 |
petcock
\ˈ ̷ ̷ˌ ̷ ̷\ noun
: a small cock, faucet, or valve set in a water pipe or pump to let air out, at the end of a steam cylinder or in a radiator or water jacket to drain it, or at the end of an internal-combustion-engine cylinder to release compression — called also draw cock |