1
a/an + koi
koi 是可数名词，单数前用 a/an。
A koi is an ornamental fish.
锦鲤是一种观赏鱼。
锦鲤
先理解核心含义，再看它在真实句子里的用法。
锦鲤
koi
A koi is an ornamental fish.
锦鲤是一种观赏鱼。
日本及东亚培育的观赏鲤,具红金色或白色花纹
Ornamental domesticated varieties of the Amur carp (Cyprinus rubrofuscus), of Japan and eastern Asia with red-gold or white coloring.
The pond in our garden has three colorful koi swimming among the lotus leaves.
我们花园的池塘里有三条五彩斑斓的锦鲤在荷叶间游动。
She feeds the koi every morning before going to work.
她每天早上上班前都会喂锦鲤。
We bought a small koi for the indoor aquarium, but it needs a bigger tank.
我们买了一条小锦鲤放在室内水族箱里，但它需要更大的鱼缸。
koi 是可数名词，单数前用 a/an。
A koi is an ornamental fish.
锦鲤是一种观赏鱼。
koi 的复数形式仍是 koi，不加 -s。
She keeps several koi in her garden.
她在自己的花园里养了几条锦鲤。
koi 指多条时，谓语动词用复数。
Those koi are very large.
那些锦鲤非常大。
Not this
She keeps three kois in a tank.
Use this
She keeps three koi in a tank.
koi 的单数和复数形式相同，都是 koi；表示多条锦鲤时不能在词尾加 -s，应写作 three koi。
Not this
I bought koi for my pond.
Use this
I bought a koi for my pond.
koi 是可数名词，单数形式前需要冠词。这里指一条锦鲤，应说 a koi；汉语没有冠词，所以容易漏掉 a。
Not this
The koi in the pond is very colorful.
Use this
The koi in the pond are very colorful.
当 koi 指多条锦鲤时是复数，虽然拼写不变，但谓语动词要用 are；汉语没有主谓一致的数变化，因此容易误用 is。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
锦鲤池
They built a koi pond behind the house.
他们在屋后建了一个锦鲤池。
喂锦鲤
It is fun to feed the koi in the park.
在公园里喂锦鲤很有趣。
养锦鲤
Keeping koi demands clean water and space.
养锦鲤需要干净的水和空间。
锦鲤养殖者
The koi breeder sold several prize-winning fish.
这位锦鲤养殖者卖出了几条获奖鱼。
锦鲤展
She took her best koi to the regional show.
她把自己最好的锦鲤带到地区展上。
锦鲤饲料
High-quality koi food helps keep their colors bright.
优质的锦鲤饲料有助于保持它们的颜色鲜艳。
Use koi naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
koi 读似 coin 少了尾音 n，池塘里锦鲤金光闪闪如金币。
语域：neutral 常见场景：koi pond、ornamental fish keeping、Japanese garden koi 是日常通用的中性词，多用于观赏鱼饲养、庭园池塘等场景，正式或非正式场合都常出现。
koi
Dictionary facts from ECDICT, WIKTIONARY.