a robin
首次提及不定个体
I saw a robin in the garden.
我在花园里看到一只旅鸫。
知更鸟；欧亚鸲
robins — plural of robin
旅鸫；美洲知更鸟；罗宾队相关人员；刺槐毒蛋白；洋槐毒素；胸部红色的各种雀形目鸟；从刺槐中提取的毒蛋白
any of various passerine birds with a red breast, especially the small Old World songbird
胸部红色的各种雀形目鸟
Any of various passerine birds (about 100 species) of the families Muscicapidae, Turdidae and Petroicidae (formerly Eopsaltriidae), typically with a red breast.
从刺槐中提取的毒蛋白
A toxalbumin obtained from the locust tree.
与被称为“罗宾”的运动队有关的人,如球迷、球员、教练等
Someone connected with any number of sports teams known as the Robins, as a fan, player, coach, etc.
一种小型旧大陆鸣禽,胸部呈红色
small Old World songbird with a reddish breast
一种大型美洲鸫,胸部和腹部呈锈红色
large American thrush having a rust-red breast and abdomen
Every morning, a robin sings in the tree outside my window.
每天早晨，一只知更鸟在我窗外的树上唱歌。
用法提示：robin 作可数名词，指知更鸟。
We saw a robin pulling a worm from the wet grass in the park.
我们看到一只知更鸟在公园潮湿的草地上拽出一条虫子。
用法提示：robin 是单数名词，作 saw 的宾语，指一种鸟。
Robins often build their nests in bushes or low branches.
知更鸟常把巢建在灌木丛或低矮的树枝上。
用法提示：robins 是复数形式，泛指知更鸟这一类鸟。
首次提及不定个体
I saw a robin in the garden.
我在花园里看到一只旅鸫。
指定已知个体
The robin flew away.
那只旅鸫飞走了。
复数表泛指
Robins sing in the morning.
旅鸫在早晨歌唱。
诗歌或旧式用语中可替换'robin'，现代英语中较少单独使用
grammar · medium
易错句子I saw two robin in the garden.
正确表达I saw two robins in the garden.
英语中可数名词的复数形式需要加-s或-es，'robin'的复数是'robins'。
grammar · medium
易错句子I saw robin in the tree.
正确表达I saw a robin in the tree.
可数名词单数前需要加冠词（如 a/an），表示泛指的一只旅鸫。
thrush 泛指鸫科鸟类，体型通常比 robin 大；robin 特指旅鸫（知更鸟），胸脯红色。
知更鸟的巢
The robin built its nest in the tree outside my window.
知更鸟在我窗外的树上筑了巢。
知更鸟的蛋
The color of the robin's egg is a beautiful light blue.
知更鸟蛋的颜色是一种美丽的淡蓝色。
红胸知更鸟
In winter, we often see a robin redbreast in the garden.
冬天，我们经常在花园里看到红胸知更鸟。
早到的知更鸟
The early robin is often a sign that spring is coming.
早到的知更鸟通常是春天即将来临的征兆。
循环赛；轮流签名
The tournament was a round robin, so each team played every other team.
这次比赛是循环赛，所以每支队伍都与其他队伍比赛。
知更鸟蛋蓝（一种淡蓝绿色）
She painted her bedroom a soft robin's egg blue.
她把卧室漆成了柔和的知更鸟蛋蓝色。
非常快乐
The children were as merry as robins on Christmas morning.
孩子们在圣诞节早晨非常快乐。
他整天在树梢上摇摆，摇摆的知更鸟，摇摆的知更鸟。
The children sang 'Rockin' Robin' at the school concert.
孩子们在学校音乐会上唱了《摇摆的知更鸟》。
当红红的知更鸟蹦蹦跳跳地走来。
My grandmother used to whistle 'When the Red Red Robin'.
我祖母过去常常吹口哨哼唱《当红红的知更鸟》。
Dictionary facts from DICTIONARY_API_DEV, ECDICT, WIKTIONARY.