引言：
一直很困惑tap的名词“水龙头”和动词“轻拍”有什么关系，突然想到水龙头不只有旋转的。。
tap /tæp/
verb
1
轻敲；轻拍；轻叩
to hit sb/sth quickly and lightly
[V] Someone tapped at the door.
有人轻轻叩门。
He was busy tapping away at his computer.
他埋头敲着电脑键盘。
[VN] Ralph tapped me on the shoulder.
拉尔夫轻轻地拍了拍我的肩膀。
2
（用…）轻轻叩击
if you tap your fingers, feet, etc. or they tap , you hit them gently against a table, the floor, etc., for example to the rhythm of music
[VN] He kept tapping his fingers on the table.
他不停地用手指轻轻敲着桌子。
[V] The music set everyone's feet tapping.
乐曲使得每个人都用脚轻轻打起拍子来。
3
~ (into) sth
利用，开发，发掘（已有的资源、知识等）
to make use of a source of energy, knowledge, etc. that already exists
[VN] We need to tap the expertise of the people we already have.
我们需要利用我们现有人员的专业知识。
[V] The movie seems to tap into a general sentimentality about animals.
这部电影似乎在激发人们对动物的普遍怜惜之情。
短语动词
tap sth↔in/out
输入，输出（信息、数字、字母等）
to put information, numbers, letters, etc. into a machine by pressing buttons
Tap in your PIN number.
输入你的个人身份识别号码。
2
（用计算机或移动电话）写，敲出，键入
to write sth using a computer or a mobile phone/cellphone
I tapped out a text message to Mandy.
我给曼迪发了一条短信。
noun
1
(especially BrE)
NAmE usually faucet
[C] 水龙头；旋塞
a device for controlling the flow of water from a pipe into a bath/ bathtub or sink
bath taps
浴缸水龙头
the hot/cold tap (= the tap that hot/cold water comes out of)
热水 / 冷水龙头
Turn the tap on/off .
打开 / 关上龙头。
Don't leave the tap running.
别把水龙头开着白白流水。
the sound of a dripping tap
水龙头滴答的漏水声
2
[C] 龙头；旋塞
a device for controlling the flow of liquid or gas from a pipe or container
a gas tap
煤气阀门
beer taps
啤酒旋塞
3
[C] 轻击；轻拍；轻敲；轻扣
a light hit with your hand or fingers
a tap at/on the door
轻轻的叩门
He felt a tap on his shoulder and turned round.
他觉得有人轻轻拍他的肩膀便转过身来。
点点关注，谢谢喵~
