1、30的英语:thirty,英 [?θ??ti] 美 [?θ??rti]。
2、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。
3、At thirty years old, he was already earning ? 40 000 a year. 他三十岁时已拿到4万英镑的年薪了。