a tap on sth
tap 常与 a、light、gentle 等词连用，后接 on 或 at 引出被敲击的部位或物体。
She felt a light tap on her shoulder.
她感到肩膀被轻轻拍了一下。
轻敲；轻拍；轻敲声；轻触；点按（屏幕）；窃听器；搭线窃听装置；（踢踏舞鞋上的）金属片；桶装酒；某种品质的事物
A device for controlling the flow of liquid or gas from a pipe or container; a faucet.
用于关闭和打开容器孔或通风口的锥形塞或销。
A conical peg or pin used to close and open the hole or vent in a container.
轻轻的敲击或拍打,发出清脆的声音；轻拍；也指这种敲击或拍打发出的声音
A light blow or strike with a clear sound; a gentle rap; a pat; also, the sound made by such a blow or strike.
轻击声
the sound made by a gentle blow
形状像锥形塞的物体,特别是指主根(植物的长锥形根)。
An object with a tapering conical form like a tap (etymology 1, noun sense 1); specifically, ellipsis of taproot (“long, tapering root of a plant”).
附在踢踏舞鞋的鞋底前后部的金属片,以产生敲击声
One of the metal pieces attached to the sole of a tap dancer's shoe at the toe and heel to cause a tapping sound.
轻击
a gentle blow
用于控制流体流动的中空装置,如从桶中抽取酒精饮料或管道中的气体或液体。
A hollow device used to control the flow of a fluid, such as an alcoholic beverage from a cask, or a gas or liquid in a pipe.
在电子设备(如手机)的触摸屏上触摸按钮、图标或特定位置以调用功能的动作
An act of touching a button, icon, or specific location on the touch screen of an electronic device such as a mobile phone to invoke a function.
水龙头
a faucet for drawing water from a pipe or cask
通过龙头抽取的酒；因此,某种类型或质量的酒；也指(比喻,非正式)某种类型或质量的任何东西。
Liquor drawn through a tap (etymology 1, noun sense 2.2); hence, a certain kind or quality of liquor; also (figurative, informal), a certain kind or quality of any thing.
声带肌肉单次收缩产生的辅音音；也指由此产生的声音
A single muscle contraction in vocal organs causing a consonant sound; also, the sound so made.
用于秘密监听电话或其他通信的装置。
A device used to listen in secretly on telephone calls or other communications.
使用此类装置秘密拦截电话或其他通信；也指此类通信的录音。
A secret interception of telephone calls or other communications using such a device; also, a recording of such a communication.
一种情况,借款政府机构在一段时间内发行债券,通常以固定价格出售,具体销售量取决于当天的市场条件。
A situation where a borrowing government authority issues bonds over a period of time, usually at a fixed price, with volumes sold on a particular day dependent on market conditions.
用于在孔中切割内螺纹的圆柱形工具,底端有切削刃,上端装有手柄以旋转工具。
A cylindrical tool used to cut an internal screw thread in a hole, with cutting edges around the lower end and an upper end to which a handle is fitted to turn the tool.
She gave a gentle tap on the door before entering.
她在进门之前轻轻地敲了一下门。
用法提示：这里 tap 是名词，表示轻敲的动作。
I felt a tap on my shoulder and turned around.
我感觉有人轻拍了一下我的肩膀，就转过身来。
用法提示：此处 tap 作名词，表示轻拍、轻碰。
There was a soft tap at the window, so I looked outside.
窗外传来轻轻的敲击声，于是我向外看去。
用法提示：这里 tap 是名词，指轻敲声。
tap 常与 a、light、gentle 等词连用，后接 on 或 at 引出被敲击的部位或物体。
She felt a light tap on her shoulder.
她感到肩膀被轻轻拍了一下。
表示敲击发出的声音时，常用 the tap of + 发声的事物。
I could hear the tap of her fingers on the keyboard.
我能听见她手指敲击键盘的轻击声。
give + 宾语 + a tap 表示轻敲某物一下，强调动作短暂。
Give the lid a tap to loosen it.
轻敲一下盖子，把它弄松。
tap 指水龙头时，用 turn on 表示打开、turn off 表示关上，代词宾语需置于中间。
Please turn the tap off when you finish.
用完请关上水龙头。
grammar · medium
易错句子Please open the tap; the sink is full.
正确表达Please turn on the tap; the sink is full.
汉语说“打开水龙头”，直译成 open the tap 不合英语习惯。英语中控制龙头、电器等的开关用 turn on / turn off（或 turn the tap on / off），open 只用于打开门窗、书本、容器等；要说“打开龙头放水”就该用 turn on the tap。
grammar · medium
易错句子Please turn off the tap water before you leave.
正确表达Please turn off the tap before you leave.
tap water 是不可数名词，意思是“自来水”这种水，不是“水龙头”这个装置；要指装置本身只能用 the tap。此处说的是关掉装置，所以 turn off 的宾语应是 the tap，而不是 tap water。
grammar · medium
易错句子There is tap in the kitchen.
正确表达There is a tap in the kitchen.
tap 是可数名词，单数形式在泛指或首次提及时必须带限定词，这里要用不定冠词 a。汉语名词没有冠词，学习者容易直接省略，但英语可数名词单数不能“裸用”。
表示自来水龙头时，美式英语通常用 faucet，英式英语通常用 tap；faucet 没有“轻拍、轻敲声”的意思。
spigot 多指桶、户外水管或管道上的龙头/旋塞，较具体且略偏技术；日常室内自来水龙头更常用 tap 或 faucet。
spout 指壶、罐等容器的出水嘴，通常没有可开关的阀门；tap 是带阀门、可控制水流的水龙头。
自来水
Is it safe to drink tap water here?
这里的自来水可以安全饮用吗？
打开水龙头
She turned on the tap to wash her hands.
她打开水龙头洗手。
关掉水龙头
Remember to turn off the tap after use.
使用后记得关掉水龙头。
热水龙头
The hot tap is stuck and won't move.
热水龙头卡住了，拧不动。
冷水龙头
She prefers to drink from the cold tap.
她更喜欢喝冷水龙头的水。
轻拍肩膀
tap + water
tap + room
tap + dance
tap + dance + -er
tap + shoe
double + tap
随时可用
We have several experts on tap to help with the project.
我们有几个专家随时可以协助这个项目。
利用，开发
The company is trying to tap into the growing market for electric vehicles.
该公司正试图利用不断增长的电动汽车市场。
巧妙应对，回避
He had to tap dance around the sensitive topic during the interview.
他在采访中不得不巧妙回避这个敏感话题。
Dictionary facts from DICTIONARY_API_DEV, ECDICT, WIKTIONARY, WORDNET.
He felt a tap on the shoulder and turned around.
他感到有人轻拍肩膀，于是转过身来。