1
it is a fallacy to do sth
it为形式主语，真正主语是不定式短语to assume...
It is a fallacy to assume that expensive things are always of better quality.
认为昂贵的东西质量一定更好，这是一种谬见。
谬见；错误观念
fallacies — plural of fallacy
先理解核心含义，再看它在真实句子里的用法。
谬见；错误观念
a mistaken belief or idea resulting from wrong reasoning
It is a fallacy to assume that expensive things are always of better quality.
认为昂贵的东西质量一定更好，这是一种谬见。
虚假或欺骗性的表象；误导视觉或心智的事物。
Deceptive or false appearance; that which misleads the eye or the mind.
因错误推理产生的误解
a misconception resulting from incorrect reasoning
貌似有决定性实则不然的论证；似是而非的论点。
An argument, or apparent argument, which professes to be decisive of the matter at issue, while in reality it is not; a specious argument.
It is a common fallacy that cracking your knuckles causes arthritis.
认为掰手指关节会导致关节炎是一种常见的错误观念。
The idea that money always brings happiness is a fallacy.
金钱总能带来幸福这种想法是一种谬见。
His argument contains several logical fallacies.
他的论证包含几个逻辑谬误。
it为形式主语，真正主语是不定式短语to assume...
It is a fallacy to assume that expensive things are always of better quality.
认为昂贵的东西质量一定更好，这是一种谬见。
由that引导的从句说明该谬误的具体内容。
The article challenges the fallacy that high test scores guarantee a good education.
这篇文章质疑了“高分就能保证良好教育”这一谬论。
of后面接动名词，表示这种错误观念所涉及的行为。
The report exposes the fallacy of judging a person's worth by their wealth.
这份报告揭露了以财富评判一个人价值的那种谬误。
commit在此意为“犯（错误）”，整个搭配表示“犯了……的谬误”。
He committed the fallacy of mistaking correlation for causation.
他犯了把相关性误当作因果关系的谬误。
Not this
This reasoning is fallacy.
Use this
This reasoning is fallacious.
fallacy 是名词，表示“谬论；谬误”，不能直接放在 be 动词后作表语来修饰主语；表示“有谬误的”时要用形容词 fallacious。
Not this
There are several fallacy in her argument.
Use this
There are several fallacies in her argument.
fallacy 是可数名词，复数形式为 fallacies。中文名词没有复数变化，但英语中 several 后必须接可数名词复数，所以要写成 fallacies。“y”结尾需要把 y 改为 i 再加 es。
Not this
He pointed out fallacy in my plan.
Use this
He pointed out a fallacy in my plan.
fallacy 作可数名词单数使用时，前面需要不定冠词 a 或其他限定词。这里泛指“一个谬误”，所以要说 a fallacy，不能直接使用裸的单数可数名词。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
逻辑谬误
Ad hominem is a common logical fallacy.
人身攻击是一种常见的逻辑谬误。
常见谬误
It is a common fallacy that we use only ten percent of our brains.
认为我们只使用了大脑的百分之十，这是一种常见的谬误。
普遍谬见
The idea that carrots improve eyesight is a popular fallacy.
认为胡萝卜能改善视力是一种普遍谬见。
合成谬误
Assuming the team will be strong because each player is strong is the fallacy of composition.
因为每位球员都很强就认为球队很强，这是一种合成谬误。
犯……的谬误
The author commits the fallacy of assuming that correlation means causation.
作者犯了把相关性当作因果关系的谬误。
沉没成本谬误
Giving up would mean wasting all the money we've spent, but that's the sunk cost fallacy.
放弃意味着浪费我们已经花掉的所有钱，但那是沉没成本谬误。
赌徒谬误
After five heads in a row, he bet on tails, believing it was due — that's the gambler's fallacy.
连续五次正面之后，他押反面，认为该出了——这就是赌徒谬误。
逻辑谬误
Attacking the speaker instead of the argument is a common logical fallacy.
攻击说话者而非论点是一种常见的逻辑谬误。
Use fallacies naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
联想：看到 fallacy 先想 fall（失误，落下）——推理时失足一步，得到的就是谬论。这只是助记，并非词源。
语域：formal 常见场景：formal writing、academic debate、critical thinking discussions fallacy 通常用于正式或学术语境，多出现在逻辑论证、学术文章或严肃讨论中，表示因错误推理而产生的谬误或错误观念。在日常口语中较少见，更正式的说法是谬论或谬见。
这些词拼写大多以 -acy 结尾（policy 只有 -cy），可与 fallacy 对照记忆，但没有一个与 fallacy 构成真正的押韵：fallacy 的重读元音是 /æ/，policy 是 /ɒ/（美式 /ɑː/），legacy 是 /ɛ/，privacy 是 /ɪ/，pharmacy 是 /ɑː/。accuracy 和 advocacy 的重读元音虽同为 /æ/，但后面的辅音和音节不同，也不押韵。注意 policy 的美式读音为 /ˈpɑːləsi/，privacy 的美式读音常为 /ˈpraɪvəsi/。
Dictionary facts from ECDICT, OCTANOVE, WIKTIONARY.