1
on a leash
表示狗被拴着皮带的状态。
The dog must be on a leash in the park.
狗在公园里必须系着皮带。
（拴动物的）皮带；链条
先理解核心含义，再看它在真实句子里的用法。
（拴动物的）皮带；链条
a rope or chain used to restrain and lead an animal
The dog must be on a leash in the park.
狗在公园里必须系着皮带。
比喻性的约束
a figurative restraint
用来约束动物的绳子(或轻链)
restraint consisting of a rope (or light chain) used to restrain an animal
三,即一加一加一所得的总数
the cardinal number that is the sum of one and one and one
I always put my dog on a leash before going for a walk.
我总是在遛狗前给狗系上狗绳。
The leash was too short, so the dog couldn't move far.
狗绳太短了，所以狗不能走远。
She bought a new leather leash for her puppy.
她给小狗买了一条新的皮狗绳。
表示狗被拴着皮带的状态。
The dog must be on a leash in the park.
狗在公园里必须系着皮带。
常用于提醒或规定。
Please keep your dog on a leash at all times.
请始终用皮带拴着你的狗。
描述狗拉扯皮带的动作。
The puppy pulled hard on the leash.
小狗使劲拉皮带。
Not this
I need to buy some leash for my dog.
Use this
I need to buy a leash for my dog.
“leash”是可数名词，不能用作不可数名词。中文中“皮带”常被当作不可数名词，但英语中需使用不定冠词或复数形式。
Not this
I always walk my dog by leash.
Use this
I always walk my dog on a leash.
表示“用皮带拴着”时，英语固定搭配是“on a leash”，而不是“by leash”。中文的“用”可能直译为“by”，但介词需用“on”。
Not this
I need to buy leash for my dog.
Use this
I need to buy a leash for my dog.
“leash”是可数名词单数，前面需要加冠词“a”。中文中常省略冠词，导致遗漏。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
用皮带拴着
All dogs must be kept on a leash in the park.
公园里所有的狗都必须用皮带拴着。
拴狗绳法律
The city has a strict leash law.
这个城市有严格的拴狗绳法律。
拴绳训练
Puppy leash training should start early.
小狗的拴绳训练应该尽早开始。
拉皮带
The dog tends to pull on the leash during walks.
这只狗在散步时总喜欢拉皮带。
皮带约束
Using a leash restraint prevents the dog from running away.
使用皮带约束可以防止狗跑掉。
系上皮带
Attach the leash to the collar before going outside.
出门前先把皮带系到项圈上。
牢牢控制某人；对某人管得很紧
The manager keeps her assistant on a short leash, checking every email.
经理对助手管得很紧，每封邮件都要检查。
急于摆脱束缚；迫不及待要开始
The team is straining at the leash to launch the new product.
团队迫不及待要推出这款新产品。
摆脱约束；挣脱控制
The rebel province slipped the leash and declared independence.
叛乱省份挣脱控制，宣布独立。
你被放开手脚了，孩子！（电影《水男孩》台词）
The dog pulled on its leash, eager to chase the squirrel.
那只狗用力拉着狗绳，急着想去追松鼠。
Use leash naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
牵狗绳 leash，联想 'leave' 出门要牵绳。
语域：neutral 常见场景：遛狗、宠物 通常用于日常遛狗场景，比较常见于宠物相关语境中。
可数名词，常与介词 on 连用，如 on a leash（系着皮带）。
Dictionary facts from ECDICT, WORDNET.