Du 在几岁时做了一些调查来解决这个问题呢？

How old was Du when she did a little research to solve the problem?

youdao

我在十几岁时增加的体重从没减下去过。

I have never lost the weight I put on in my teens.

《柯林斯英汉双解大词典》

大多数吸烟的人都是在十几岁时开始吸的。

Most people who smoke began smoking in their teens.

《柯林斯英汉双解大词典》

她十几岁时就开始在舞台上表演了。

She began to be on the stage when she was a teenager.

youdao

现在你知道我二十几岁时为什么一直在喊叫了。

Now you know why I spent my twenties crying.

youdao

他们在四十几岁时戒了烟。晚上，温度降到四十几度。

They stopped smoking in their forties. At night the temperature fell into the forties.

youdao

也就是说，在少年时期后期或二十几岁时。

That is, when they are in their late teenage years or early twenties.

youdao

也就是说，在少年时期后期或二十几岁时。

That is, when they are in their late teenage years or early twenties.

youdao