1·塔高30米。
The tower stands 30 metres high.
—— 《牛津词典》
2·上班要走往返30英里的路程。
It's 30 miles round trip to work.
—— 《牛津词典》
3·5除30等于6。
5 divides into 30 6 times.
—— 《牛津词典》
4·这条公路限定时速30英里。
The road has a 30 mph speed limit.
—— 《牛津词典》
5·我养鸟大约有三十年了。
I have kept birds for some 30 years.
—— 《柯林斯英汉双解大词典》
6·申请务必于四月三十日之前寄到。
Applications must be in by April 30.
—— 《牛津词典》
7·比斯经营农场已有30年。
Bease has been farming for 30 years.
—— 《柯林斯英汉双解大词典》
8·班级的数目从25到30不等。
Class numbers vary between 25 and 30.
—— 《牛津词典》
9·这辆汽车每加仑汽油可行驶30英里。
This car does 30 miles to the gallon.
—— 《牛津词典》
10·他们结婚至今已30年。
They've been married now for 30 years.
—— 《柯林斯英汉双解大词典》