1、thirty的中文意思是30的意思。

2、双语例句：

（1）Only thirty students graduated in Chinese last year.

去年只有三十名学生获得汉语学士学位。

（2）She thinks nothing of walking thirty miles a day.

她认为一天步行三十英里不足为奇。

（3）Hes described as around thirty years old, six feet tall and of medium build.

他被描述为大约三十岁，身高6英尺，体格中等。