1·五月份有31天。
There are 31 days in May.
—— 《牛津词典》
2·公园从5月1日到10月31日开放。
The park is open from 1 May to 31 October.
—— 《牛津词典》
3·他从华盛顿打来了电话，他已在那里连续呆了31个小时了。
He called from Washington, having been there for 31 hours straight.
—— 《柯林斯英汉双解大词典》
4·我快三十一岁了，该是我在工作中的付出收获成果的时候了。
I'm nearly 31 and it's about time I had something to show for my time in my job.
—— 《柯林斯英汉双解大词典》
5·现在很热，按摄氏度算的话，我认为得有31度。
It's hot, and as for Celsius right now, I think it's about 31 degrees.
6·英语是一种以十为基数，或者说是十进制的语言，十四和三十一这样的单词证明了这一点。
English is a base-10 or decimal language, as evidenced by words like 14 and 31.
7·在12月31号，巴库巴的一名炸弹袭击者在一个警察巡逻队附近引爆了她的自杀式炸弹背心，造成5名警察和4名平民受伤。
On December 31, a bomber in Baqouba detonated her suicide vest close to a police patrol, wounding five policemen and four civilians.
8·参赛作品的截止期是3月31日。
The closing date for entries is 31 March.
—— 《牛津词典》
9·这钱要到1月31日才可支付。
The money is not payable until January 31.
—— 《柯林斯英汉双解大词典》
10·现代俄语字母表有31个字母。
The modern Russian alphabet has 31 letters.
—— 《柯林斯英汉双解大词典》