She's a one-year-old teddy bear hamster.

她是一个一岁的泰迪熊仓鼠。

youdao

They have a one-year-old son.

现在他们有了个一岁大的儿子。

youdao

I've got a one-year-old grandchild who's sick today and has gone to hospital.

我有一个一岁的孙子今天病倒了，送去了医院。

youdao

Helen was their first child. Until she was a year-and-one-half old, Helen Keller was just like any other child.

VOA: special.2009.11.08

Any of you who have access to a four- or five-year-old, a sibling or something-- Do not take one without permission, but if you have access to a four- or five-year-old you can do this yourself.

如果你身边有四五岁大的孩子,兄弟姐妹什么的,一定要先得到同意再去试验,如果你身边有四五岁大的孩子,你可以自己去试试

耶鲁公开课 - 心理学导论课程节选

You put a child on one side of the mountains and you ask him to draw it, and a four- or five-year-old can do it easily, but then you ask him to draw it as it would appear from the other side and children find this extraordinarily difficult.

你让孩子在模型的一边,要求他把自己看到的三山模型画出来,四五岁的儿童便能够轻易做到,但是,如果你要求儿童画出,从模型另一边看过去的样子,儿童就会觉得非常困难

耶鲁公开课 - 心理学导论课程节选

Imagine: a one-year-old boy arrives at an emergency room in New York at 3 a.m. with an asthma attack.

FORBES: Stabbing Needles Into Children To Treat Asthma: Malpractice, Or Just A Very Bad Idea?

Jim Lanzone, chief executive of a one-year-old website called Clicker, is hoping he can pull a mini-Annenberg by answering the new question on viewers' minds.

FORBES: Magazine Article

The idea is that while your phone has lots of apps that could appeal to a one-year-old, you hate giving up your precious phone to such potential destruction.

FORBES: Parents: Give Your Kids A Placemat Instead Of An App