a flock of + pigeons
pigeon 是可数名词，复数为 pigeons；表示成群的鸽子时常用 a flock of pigeons。
A flock of pigeons gathered around the fountain.
一群鸽子聚集在喷泉周围。
鸽子
pigeons — plural of pigeon
鸽肉；鸽派人物；和平主义者；受雇运送电影胶片的人；鸽形目鸠鸽科中的几种鸟之一；野生和家养鸟类,身体重,腿短
a bird of the family Columbidae, wild or domesticated, with a heavy body and short legs
鸽形目鸠鸽科中的几种鸟之一
One of several birds of the family Columbidae within the order Columbiformes.
野生和家养鸟类,身体重,腿短
wild and domesticated birds having a heavy body and short legs
这种鸟的肉
The meat from this bird.
和平主义者、抚慰者、孤立主义者,即鸽派人物
A pacifist, appeaser, an isolationist, a dove.
被雇来将电影胶片运出交通受限地区的人
A person hired to transport film footage out of a region where transport options are limited.
A pigeon perched on the roof and watched the street below.
一只鸽子停在屋顶上，看着下面的街道。
用法提示：pigeon作名词，单数形式，指鸽子这种鸟。
These pigeons seem to know exactly when people bring food to the park.
这些鸽子似乎完全知道人们什么时候带食物来公园。
用法提示：pigeons为pigeon的复数名词，指多只鸽子。
We could hear pigeons cooing softly in the trees behind the house.
我们能听到鸽子在屋后的树林里轻柔地咕咕叫。
用法提示：pigeons是pigeon的复数名词，作hear的宾语，指鸽子。
pigeon 是可数名词，复数为 pigeons；表示成群的鸽子时常用 a flock of pigeons。
A flock of pigeons gathered around the fountain.
一群鸽子聚集在喷泉周围。
表示饲养鸽子时用 keep 或 raise，后面接复数 pigeons。
My grandfather has kept pigeons for thirty years.
我爷爷养鸽子已经养了三十年。
by carrier pigeon 表示“用信鸽（传递）”，carrier pigeon 前不加冠词，用于说明方式。
The soldiers sent the message by carrier pigeon.
士兵们用信鸽传递了消息。
grammar · medium
易错句子There are three pigeon sitting on the roof.
正确表达There are three pigeons sitting on the roof.
英语可数名词跟在数词 three 后面时必须用复数形式；汉语名词没有复数词尾，数量只靠“三只”这类量词表达，所以中国学习者常漏掉 -s。改成 pigeons 才能与 three 在数上保持一致。
grammar · medium
易错句子I saw pigeon in the park this morning.
正确表达I saw a pigeon in the park this morning.
英语单数可数名词前面一般需要冠词；汉语“我看见鸽子”里没有冠词，直译过去就会漏掉 a。这里泛指一只不确定的鸽子，须用不定冠词 a 引出这个单数个体。
grammar · medium
易错句子Pigeon is a common bird in cities.
正确表达The pigeon is a common bird in cities.
英语表示整个类属（类指）时用“the + 单数可数名词”，不能用光杆单数可数名词；汉语“鸽子是城里常见的鸟”没有冠词，容易直译成 Pigeon is...。此处指鸽子这一类鸟，须加定冠词 the（也可说 Pigeons are common birds in cities）。
信鸽
The soldier released a carrier pigeon with a message tied to its leg.
士兵放出一只信鸽，腿上绑着一条消息。
野鸽（城市里野化的家鸽）
Feral pigeons gather in the square every morning.
每天早晨，野鸽都会聚集在广场上。
赛鸽运动
Pigeon racing is a popular hobby in some regions.
在一些地区，赛鸽是一项很受欢迎的爱好。
诱鸽；告密者，线人
The police used him as a stool pigeon to catch the gang.
警方利用他当线人，抓捕了这个团伙。
泥鸽（射击用的飞靶）
They spent the whole afternoon shooting clay pigeons.
他们整个下午都在打泥鸽靶。
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一群鸽子
A flock of pigeons flew over the rooftops.
一群鸽子飞过屋顶。