At the age of thirty-one, Florence went to Germany and learned all about nursing.

三十一岁时，弗洛伦斯去了德国，学习了所有关于护理的知识。

youdao

There are about thirty-one million blacks in the U.S.

美国大约有三千一百万黑人。

《柯林斯英汉双解大词典》

In America, people are faced with more and more decisions every day, whether it's picking one of thirty-one ice cream flavors, or deciding whether and when to get married.

在美国，人们每天都面临着越来越多的决定，无论是从31种冰淇淋口味中选择一种，还是决定是否结婚和何时结婚。

youdao

The goal is to reduce monthly payments for five years to no more than thirty-one percent of the borrower's monthly income.

VOA: special.2009.02.20

You can look at page thirty-one in the Hughes edition.

你们可以看到休斯版本的31页。

耶鲁公开课 - 弥尔顿课程节选

There's twenty-one days, there's thirty days, there's twenty-four hours. Now look at this!

有二十一天法,三十天法,二十四小时法,还有这个

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

Thirty-one officers took part in the search but were unable to find the elusive large cat.

BBC: Your highlights of 2012 in drawings

Thirty-one percent of those people said they had gone on to marry the person.

FORBES: How To Work With Someone After A Romantic Breakup

Thirty-one pledged delegates are up for grabs Tuesday in Montana and South Dakota.

CNN: Steady stream of superdelegates pushed Obama over top