n. 龙头,阀门,塞子;窃听器,窃听;螺丝攻,攻螺纹,攻丝;轻击
vt. 打开…放液体;轻拍,轻击
vi. 攻螺纹
“龙头”“塞子”语义来源于日耳曼语、古英语tæppa(木桶通气孔的销钉)和tæppian(木桶上的塞子)。
“拍击”语义来自于拟声词。
例:
n.
Connect the hose to the tap and turn on the water. 把软管接在龙头上, 打开水龙头。
The detectives put a tap on the suspect's telephone. 侦察人员在嫌疑犯的电话上装窃听装置。
He gave a tap at the microphone before speaking. 他在讲话前先轻叩了一下扩音器。
vt.
The bar tender tapped a new keg of beer. 调酒师开了一桶新啤酒。
The phones of important officials were tapped. 政府要员们的电话遭到窃听
One of my staff tapped me on the shoulder. 我的一个员工轻拍了一下我的肩膀。
vi.
The difference between threading and tapping is the surface on which the processes happen. The threading process creates threads on the outside of a fastener, like a bolt, and it’s done with a die tool. The tapping process creates threads on the inside of a drilled hole, and it’s done with a tapping tool. 套扣和攻丝是在不同工件面上进行。套扣是在紧固件外径上切出螺纹，例如螺栓，用板牙实现。攻丝是在钻出的孔里面切出螺纹，用螺纹攻实现。