ballcock
英 [ˈbɔːlkɒk] 
美 [ˈbɔːlkɑːk]
n. 浮球旋塞; 浮球阀
复数：ballcocks
牛津词典
noun
- 浮球旋塞；浮球阀
a device with a floating ball that controls the amount of water going into a container, for example the water tank of a toilet
英英释义
noun
- floating ball that controls level in a water tank
Synonym: ball cock
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