1
zero article + sloth
这里的 sloth 意为“懒惰、怠惰”，是不可数名词，前面不加 a/an。
Sloth is one of the seven deadly sins.
懒惰是七宗罪之一。
树懒
sloths — plural of sloth
先理解核心含义，再看它在真实句子里的用法。
树懒
a slow-moving tropical American mammal that lives in trees and eats leaves and fruits
Sloth is one of the seven deadly sins.
懒惰是七宗罪之一。
懒惰；思维迟钝；不愿行动或劳动；冷漠与嗜睡交织的感觉；拖沓的闲散。
Laziness; slowness of mind; disinclination to action or labour; a feeling combining indifference and lethargy; a dragging idleness.
树懒亚目中的任何动物。
Any animal in the suborder Folivora.
His sloth kept him from finishing his homework.
他的懒惰使他没能完成作业。
She was tired of her own sloth and started exercising.
她厌倦了自己的懒惰，开始锻炼。
The book describes sloth as a serious character flaw.
这本书把懒惰描述为一种严重的性格缺陷。
这里的 sloth 意为“懒惰、怠惰”，是不可数名词，前面不加 a/an。
Sloth is one of the seven deadly sins.
懒惰是七宗罪之一。
sloth 指“树懒”时是可数名词，单数前需加 a 或 the。
A sloth sleeps up to 20 hours a day.
一只树懒一天可睡多达20个小时。
sloths 是 sloth 的复数形式，可泛指树懒这类动物。
Sloths are found in the rainforests of Central and South America.
树懒生活在中美洲和南美洲的热带雨林中。
Not this
He is very sloth.
Use this
He is very slothful.
sloth 是名词，表示“懒惰”或“树懒”，不能当形容词作表语；描述某人懒惰应使用形容词 slothful，或用更常见的 lazy。
Not this
He is a sloth.
Use this
He is lazy.
sloth 指“懒惰”这种品性或“树懒”这种动物，不能指“懒人”；说某人懒惰应用 lazy 或 slothful。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
三趾树懒
The three-toed sloth climbs very slowly through the trees.
三趾树懒在树上爬行得非常缓慢。
地懒（已灭绝的巨型树懒）
Ground sloths were much larger than the sloths we see today.
地懒比我们今天见到的树懒大得多。
树懒保护区
We spent the morning at a sloth sanctuary in Costa Rica.
我们在哥斯达黎加的一个树懒保护区度过了一个上午。
懒惰之罪
Sloth is traditionally listed among the seven deadly sins.
懒惰传统上被列为七宗罪之一。
思维惰性
Relying on search engines all the time can lead to mental sloth.
凡事都依赖搜索引擎会导致思维惰性。
懒惰的一生
He regretted the years he had wasted in a life of sloth.
他后悔自己在懒惰中荒废了那些岁月。
像树懒一样懒
You've been as lazy as a sloth all morning; please wash the dishes.
你整个早上像树懒一样懒；请把碗洗了。
像树懒一样慢
The old computer is as slow as a sloth.
这台旧电脑慢得像树懒一样。
懒惰像铁锈，比劳动磨损得更快；经常使用的钥匙总是闪亮的。
This aphorism by Benjamin Franklin warns that laziness, like rust, quietly destroys a person's diligence and productivity.
本杰明·富兰克林的这句格言提醒我们，懒惰如同铁锈，会悄然侵蚀一个人的勤奋与效率。
Use sloths naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
树懒（sloth）动作极慢，把 slow 的 w 换成 th 就成了 sloth——慢到懒得动，所以也指懒惰。
语域：mixed 常见场景：动物科普、文学/正式书面语、宗教文化 sloth 作“树懒”讲时是普通动物名，多用于科普或日常语境；作“懒惰”讲时较正式，常见于文学或书面表达；另指“七宗罪”之一，多出现在宗教或文化讨论中。
复数 sloths 仅用于“树懒”义项；“懒惰/怠惰”义项为不可数，无复数形式。
Dictionary facts from ECDICT, WIKTIONARY.