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a/an + singular countable noun
earthworm 是可数名词，单数前用 an，因为其读音以元音音素开头。
An earthworm burrows into the soil.
蚯蚓钻入土壤中。
蚯蚓
先理解核心含义，再看它在真实句子里的用法。
蚯蚓
earthworm
An earthworm burrows into the soil.
蚯蚓钻入土壤中。
生活在土里的蠕虫。
A worm that lives in the ground.
在土壤中打洞并帮助通气的陆生蠕虫；通常在地面凉爽或潮湿时出现；钓鱼者用作诱饵
terrestrial worm that burrows into and helps aerate soil; often surfaces when the ground is cool or wet; used as bait by anglers
正蚓科或更广义的蚯蚓亚目环节动物。
A worm of the family Lumbricidae, or, more generally, of the suborder Lumbricina.
可鄙的人；卑躬屈膝者。
A contemptible person; a groveller.
After the rain, an earthworm crawled across the wet sidewalk.
雨后，一条蚯蚓爬过潮湿的人行道。
The gardener carefully placed the earthworm back into the flower bed.
园丁小心地把那条蚯蚓放回花坛里。
Earthworms improve the soil by making tunnels as they move through it.
蚯蚓在土壤中穿行时挖出通道，从而改良土壤。
earthworm 是可数名词，单数前用 an，因为其读音以元音音素开头。
An earthworm burrows into the soil.
蚯蚓钻入土壤中。
用复数形式不带冠词可泛指蚯蚓这一类动物，谓语动词也用复数。
Earthworms help aerate the soil.
蚯蚓有助于土壤通气。
use sth as bait 表示“把某物用作鱼饵”，as 后接用途。
Anglers use earthworms as bait.
垂钓者把蚯蚓用作鱼饵。
surface 在此作动词，意思是“来到地面、钻出地面”。
Earthworms surface when the ground is cool or wet.
地面凉爽或潮湿时，蚯蚓会钻出地面。
Not this
There are many earthworm in the soil.
Use this
There are many earthworms in the soil.
earthworm 是可数名词，many 后面必须用复数形式 earthworms。
Not this
Earthworm is good for the garden.
Use this
Earthworms are good for the garden.
表示类别时，可数名词 earthworm 通常用复数形式 Earthworms 或 the + 单数，不能直接用光杆单数。
Not this
I found a earthworm in the garden.
Use this
I found an earthworm in the garden.
earthworm 以元音音素 /ɜ/ 开头，所以不定冠词要用 an，不用 a。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
蚯蚓粪
The gardener noticed earthworm casts on the lawn.
园丁注意到草坪上有蚯蚓粪。
蚯蚓洞
Earthworm burrows help water reach plant roots.
蚯蚓洞帮助水分到达植物根部。
蚯蚓堆肥
She uses earthworm composting to recycle kitchen scraps.
她用蚯蚓堆肥来回收厨房剩菜。
蚯蚓种类
There are thousands of earthworm species worldwide.
全世界有数千种蚯蚓。
蚯蚓种群
Healthy soil supports a large earthworm population.
健康的土壤能维持庞大的蚯蚓种群。
蚯蚓养殖场
They started an earthworm farm to produce organic fertilizer.
他们开办了一个蚯蚓养殖场来生产有机肥料。
Use earthworm naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
把 earth（泥土）和 worm（虫）合在一起，就是钻在土里的虫——蚯蚓。
语域：neutral 常见场景：日常对话、科普文章、园艺 该词为中性常用词，通常用于日常对话、科普或园艺场景，不属于正式或俚语。
All these words share the final /wɝm/ sound with the -worm in earthworm, so they rhyme with it. Beware of lookalikes such as warm /wɔrm/ and form /fɔrm/, which are spelled similarly but have a different vowel sound and do not rhyme.
Dictionary facts from ECDICT, WIKTIONARY.