1
a pulley for doing sth
pulley 是可数名词，复数形式为 pulleys；a pulley for ... 表示用途。
They built a simple pulley for lifting bricks to the roof.
他们做了一个简单的滑轮，用来把砖吊到屋顶上。
滑轮；滑车
pulleys — plural of pulley
先理解核心含义，再看它在真实句子里的用法。
滑轮；滑车
a simple machine with a grooved wheel and a rope, used to change the direction of a pulling force or to lift heavy objects
They built a simple pulley for lifting bricks to the roof.
他们做了一个简单的滑轮，用来把砖吊到屋顶上。
简单机械之一；有槽缘的轮,绕以绳索或链条以提升物体(两个以上滑轮组成滑轮组更有效,可省力但增加距离)。
One of the simple machines; a sheave, a wheel with a grooved rim, in which a pulled rope or chain lifts an object (more useful when two or more pulleys are used together, as in a block and tackle arrangement, such that a small force moving through a greater distance can exert a larger force through a smaller distance).
手指的环状韧带。
Annular ligament of the finger.
They used a pulley to pull the heavy bucket up from the well.
他们用滑轮把沉重的桶从井里拉了上来。
The blinds are raised and lowered with a simple pulley.
百叶窗靠一个简单的滑轮升降。
You can use a pulley to lift heavy boxes without hurting your back.
你可以用滑轮抬起沉重的箱子，而不弄伤后背。
pulley 是可数名词，复数形式为 pulleys；a pulley for ... 表示用途。
They built a simple pulley for lifting bricks to the roof.
他们做了一个简单的滑轮，用来把砖吊到屋顶上。
with a pulley 作方式状语，表示借助滑轮这一工具。
The workers lifted the heavy engine with a pulley.
工人们用滑轮吊起了沉重的发动机。
描述滑轮运作时，常用 run over/round a pulley 表示绳索绕过滑轮。
A rope runs over a pulley and changes direction.
绳索绕过滑轮后改变方向。
Not this
He used pulley to lift the box.
Use this
He used a pulley to lift the box.
pulley 是可数名词单数，前面需要加冠词 a；中文没有冠词概念，所以容易漏掉。
Not this
There are two pullies in the machine.
Use this
There are two pulleys in the machine.
pulley 以元音字母 e + y 结尾，复数直接加 s 构成 pulleys，而不是把 y 变 ies。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
滑轮系统
The pulley system made it easy to lift the heavy crate.
滑轮系统使提起沉重的板条箱变得容易。
定滑轮
A fixed pulley changes the direction of the applied force.
定滑轮改变作用力的方向。
动滑轮
A movable pulley moves along with the load.
动滑轮随重物一起移动。
绳索和滑轮
They used a rope and pulley to pull the boat onto the shore.
他们用绳索和滑轮把船拉上岸。
滑轮机构
The elevator uses a pulley mechanism to move the cabin.
电梯使用滑轮机构来移动轿厢。
Use pulleys naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
联想 pull（拉）+轮子：滑轮就是用绳子拉着改变用力方向的轮子。
语域：neutral 常见场景：机械维修、健身器材、物理课堂 pulley（滑轮）在日常会话和技术场景中都比较常见，通常是中性词，没有明显的正式或非正式色彩。
与 pulley /ˈpʊli/ 押韵的词包括 bully、woolly、fully（/ˈbʊli/、/ˈwʊli/、/ˈfʊli/）。注意拼写以 -lley 结尾的 valley、alley、trolley 虽然拼写相似，但元音不同，不押韵。
Dictionary facts from ECDICT, WIKTIONARY.