powder to plug tap-hole堵眼粉
plug-in hole通孔插装
pih plug-in hole通孔插装
plug-hole-filter theory塞子
plug-and-feather hole[矿业] 插楔开石孔
oil-hole plug油孔塞
myltiple-hole plug多也透气砖
tap-hole plug放液孔塞
N-COUNT（可数名词） A plughole is a small hole in a bathtub or sink that allows the water to flow away and into which you can put a plug. (浴缸或水池的)放水孔 [英国英语]