n.开孔；导出液体；流出口；浇铸；抽头
动词tap的现在分词.
The amount of lubricity is controlled for the particular machining operation and tool, such as tapping or face milling. 润滑剂的量是跟道具特定的机加工工艺和刀具而特设，例如开孔或面铣。
n.窃听
adj.搭线窃听的
动词wiretap的现在分词形式.
自动攻丝
