30 的英语是 "thirty."

来源:"thirty" 是英文中表示数字 30 的单词。

下面是一些英文例句和中文翻译:

"I'm 30 years old." (我30岁了。)
"The temperature is 30 degrees Celsius." (温度是30摄氏度。)
"She has 30 dresses in her closet." (她衣柜里有30件裙子。)
"He has been working for the company for 30 years." (他在这家公司工作了30年。)
"We have to finish the project in 30 days." (我们必须在30天内完成这个项目。)