thirty + [noun]
当后面跟可数名词时，名词用复数形式。
She bought thirty apples.
她买了三十个苹果。
比二十多十的
ten more than twenty; 30
比二十多十的
being ten more than twenty
She waited for thirty minutes before the bus arrived.
她等了三十分钟公交车才来。
用法提示：thirty 作形容词修饰 minutes，表示数量三十。
There are thirty students in my English class.
我的英语班上有三十名学生。
用法提示：thirty 作定语修饰 students，表示数量三十。
He saved thirty dollars by buying the ticket online.
他通过网上买票省了三十美元。
用法提示：thirty 作定语修饰 dollars，表示三十这个数目。
当后面跟可数名词时，名词用复数形式。
She bought thirty apples.
她买了三十个苹果。
表示年龄时，'years old'可以省略，但通常用完整形式。
He is thirty years old.
他三十岁。
grammar · medium
易错句子I have thirteen students in my class.
正确表达I have thirty students in my class.
因发音相似，学习者常将"thirty"（三十）误说成"thirteen"（十三）。注意元音长度和末尾/n/音的差异，三十的英文是/ˈθɜːti/，而十三是/ˌθɜːˈtiːn/。
grammar · medium
易错句子He is thirty years.
正确表达He is thirty years old.
在英语中表达年龄时，数词后需跟"years old"（岁）作表语补足语，直接说"years"是受中文“他三十岁”直译的影响。
混淆点：音近且均为数字，但 thirteen 是 13，thirty 是 30。
混淆点：拼写相似（thir-开头），但 third 是序数词，thirty 是基数词。
三十岁
She is thirty years old.
她三十岁。
三十分钟
The bus comes every thirty minutes.
公交车每三十分钟来一趟。
三十天
The ticket is valid for thirty days.
这张票三十天内有效。
三十个人
About thirty people attended the meeting.
大约三十个人参加了会议。
三十公里
We walked thirty kilometers today.
我们今天走了三十公里。
百分之三十
Thirty percent of the students passed the exam.
百分之三十的学生通过了考试。
thirty = thir- + -ty；同根词：three（三）、thirteen（十三）
thirty = thir- + -ty；同缀词：twenty（二十）、forty（四十）
小睡，打个盹
He took thirty winks during the break.
他在休息时打了个盹。
出卖他人所得的酬金，背叛的代价
He would not sell his principles for thirty pieces of silver.
他不会为了三十块银币出卖自己的原则。
三十多岁的人（的）
The new coach is a thirty-something with little experience.
新教练是个三十多岁的人，没什么经验。
九月、四月、六月和十一月有三十天。
A well-known traditional English verse often used to teach the lengths of the months.
一句广为流传的英文传统口诀，常用于教孩子记住哪些月份有三十天。
三十岁，迷人又得意。
A famous line from the 2004 film '13 Going on 30', spoken by Jennifer Garner's character, and widely used to celebrate turning thirty.
出自2004年电影《女孩梦三十》，由詹妮弗·加纳饰演的角色说出，后来成为英语中庆祝三十岁的流行语。
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Includes Synonyms & Antonyms
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Dictionary facts from DICTIONARY_API_DEV, ECDICT, WIKTIONARY.