She is twelve years old.

她十二岁。

Twelve months in a year.

一年有十二个月。

Alex was twelve years old.

亚历克斯当时十二岁。

I was born twelve years ago.

我出生在十二年前。

Lingling is twelve years old.

玲玲十二岁。

In New York, it's twelve o'clock.

在纽约，现在是十二点。

You ate twelve chocolate brownies.

你吃了十二块巧克力布朗尼。

There are twelve boys on the bike.

自行车上有十二个男孩。

We have lunch at half past twelve.

我们在十二点半吃午饭。

He was going to do twelve of these.

他打算做十二个这样的。