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a swine
swine 作‘猪’解时是可数名词，单数可用 a swine。
A swine was lying in the mud.
一头猪躺在泥里。
猪
先理解核心含义，再看它在真实句子里的用法。
猪
a pig
A swine was lying in the mud.
一头猪躺在泥里。
猪,猪科动物,尤指农业语境中的。
A pig, an animal of family Suidae, especially in agricultural contexts.
体型粗壮、腿短的杂食动物
stout-bodied short-legged omnivorous animals
猪肉,猪的肉。
Pig, pork, the meat of pigs.
The farmer keeps a dozen swine in the barn.
那位农民在谷仓里养了十二头猪。
These swines have grown bigger since March.
这些猪自三月以来长大了不少。
A swine needs clean water and enough space.
猪需要干净的水和足够的空间。
swine 作‘猪’解时是可数名词，单数可用 a swine。
A swine was lying in the mud.
一头猪躺在泥里。
swine 可转指人，表示‘卑鄙的家伙’，作表语时用 be a swine。
He is a swine to treat her that way.
他那样对待她，真是个混蛋。
swines 是 swine 的复数形式，用于指多个卑鄙的人。
Those swines have eaten all the cake!
那些混蛋把蛋糕全吃光了！
Not this
He is swine.
Use this
He is a swine.
当swine表示“卑鄙的家伙”时是可数名词，单数作主语补语时必须带冠词a。汉语没有冠词系统，学习者容易漏掉a；加上a后句子才语法完整，意思为“他是个卑鄙的家伙”。
Not this
There are many swines in the farm.
Use this
There are many swines on the farm.
表示“在农场”介词要用on，不能用in；汉语“在农场”直译为in the farm是常见的母语迁移错误。这里swines是词典承认的复数形式，句子其他部分正确，只需将in改为on。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
猪流感
The outbreak of swine flu closed many schools.
猪流感的爆发导致许多学校停课。
猪瘟
Swine fever is highly contagious among pigs.
猪瘟在猪之间传染性极强。
对牛弹琴；明珠暗投
Trying to explain poetry to them is casting pearls before swine.
想要向他们解释诗歌就像对牛弹琴。
生猪生产
Modern swine production relies on advanced technology.
现代生猪生产依赖先进技术。
贪得无厌的家伙
He is a greedy swine who took all the credit.
他是个贪得无厌的家伙，把功劳都抢走了。
猪粪肥
Swine manure is often spread on fields as fertilizer.
猪粪肥常被撒到田里作肥料。
明珠暗投；对牛弹琴
Don't waste your time explaining art to him; you'd be casting pearls before swine.
别浪费时间跟他解释艺术，你简直是在对牛弹琴。
不要把你们的珍珠丢在猪前。
A famous line from the Bible (Matthew 7:6, King James Version); used to say that offering something precious to someone who cannot appreciate it is a waste.
出自《圣经·马太福音》7章6节（英王钦定本），用来表示把珍贵的东西给不识货的人是白费功夫。
Use swine naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
把 swine 拆成 s + wine（酒），想象一头猪在酒里打滚——记住 swine 是猪，也指卑鄙的家伙。
语域：formal 常见场景：农业、兽医、学术论文 swine 表示“猪”时多用于农业、兽医或学术论文，属于较正式的说法；日常口语中更常说 pig。
swines
Dictionary facts from ECDICT, WIKTIONARY.