... 给水小龙头 = petcock 给水小龙头 = petcocks 给装袖子的 = sleeved ...
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N a small valve for checking the water level in a steam boiler or draining condensed steam from the cylinder of a steam engine (蒸汽锅炉内检查水位的)小旋塞; (蒸汽机汽缸的)泄气阀
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