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a/an + yearling
yearling 是可数名词，指满一岁但未满两岁的动物；在赛马语境中也常指一岁赛马。单数前通常要加 a/an 或 the。
A yearling stood apart from the herd.
一头一岁幼畜站在远离兽群的地方。
一岁马；一岁赛马
yearlings — plural of yearling
先理解核心含义，再看它在真实句子里的用法。
一岁马；一岁赛马
a one-year-old racehorse
A yearling stood apart from the herd.
一头一岁幼畜站在远离兽群的地方。
一到两岁之间的动物；第二年的幼畜。
An animal that is between one and two years old; one that is in its second year (but not yet two full years old).
在下一个1月1日之前被视为一岁的赛马。
A racehorse that is considered to be one year old until a subsequent January 1st.
The farmer sold the yearling at the autumn market.
农场主在秋季集市上卖掉了那头一岁的幼畜。
The trainer is teaching the yearling to follow simple commands.
驯养员正在教这头一岁的幼畜听从简单的指令。
We watched the yearling run across the pasture with its mother.
我们看着那头一岁的幼畜和妈妈一起跑过牧场。
yearling 是可数名词，指满一岁但未满两岁的动物；在赛马语境中也常指一岁赛马。单数前通常要加 a/an 或 the。
A yearling stood apart from the herd.
一头一岁幼畜站在远离兽群的地方。
yearling 可作定语放在另一个名词前，表示“一岁的”，如 yearling filly（一岁小母马）。
They sold a yearling filly at auction.
他们在拍卖会上卖了一匹一岁的小母马。
yearling 的复数形式为 yearlings，规则变化；作主语时谓语动词用复数。
Yearlings need attentive care.
一岁幼畜需要细心的照料。
Not this
The farm sold a yearling foal.
Use this
The farm sold a yearling.
foal 指不满一岁的小马，yearling 指一岁至两岁（按次年1月1日算一岁）的幼畜，二者年龄阶段冲突，不能搭配。直接用 yearling 即可表达“一岁马/一岁幼畜”之意。
Not this
My horse is yearling.
Use this
My horse is a yearling.
yearling 是可数名词，不是形容词。汉语可以说“这匹马一岁”，但英语中作表语指具体一头马时，单数可数名词前需要加不定冠词 a，所以要说 a yearling。
Not this
My baby boy is a yearling.
Use this
My baby boy is one year old.
yearling 只用于动物（尤指赛马），不能用于人。表示人的年龄要用 one year old（或 one-year-old），而不能用 yearling。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
一岁母马
The yearling filly was sold for a record price at the auction.
那匹一岁母马在拍卖会上以创纪录的价格售出。
一岁公马
The trainer was impressed by the yearling colt's speed.
驯马师对那匹一岁公马的速度印象深刻。
一岁马拍卖会
Many owners attended the yearling sale hoping to find a champion.
许多马主参加了这次一岁马拍卖会，希望能找到一匹冠军马。
一岁母牛
The farmer kept the yearling heifer for breeding.
农场主留下那头一岁母牛用于繁殖。
一岁阉牛
Each yearling steer was weighed before being moved to pasture.
每头一岁阉牛在转移到牧场前都要称重。
Use yearlings naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
year（年）+ -ling（幼小后缀，如 duckling 小鸭）→ 记住“满一岁的幼崽”。
语域：neutral 常见场景：赛马、动物饲养 该词是中性词，通常用于赛马和动物饲养等专业语境，表示一岁大的马或其他动物；日常口语中较少使用。
指出生后第二年（约一岁到两岁之间）的动物；在赛马术语中特指到第二个1月1日为止仍算一岁的马。
Dictionary facts from ECDICT, WIKTIONARY.