儿童通常在11或12岁时升读中学。

Children usually transfer to secondary school at 11 or 12.

那个12岁的男孩失踪三天了，警方对他的安全感到担忧。

The police are concerned for the safety of the 12-year-old boy who has been missing for three days.

年仅12岁时，她就开始如饥似渴地阅读报纸。

She began devouring newspapers when she was only 12.

她从小就喜欢唱歌，12岁开始了声乐训练。

She loved singing as a child and started vocal training at 12.

她按照花名册上的名单对她班上30个12岁大的孩子进行点名。

She calls the register for her class of thirty 12 year olds.

我读到你让一些12岁的孩子在宣传活动中做帮手。

I've read that you've enlisted some 12-year-olds to help out in your campaign

12岁的孩子能踩到踏板已经是不可思议，就更不用说开车了。

It is incredible that the 12-year-old managed to even reach the pedals, let alone drive the car.

如果他们看起来不到12岁，门卫不得允许其进入观看该影片。

If they appear to be under 12, then the doorman is not allowed to permit them entry to the film.

这里的孩子都是12岁以上。

All the children here are12 plus.