她体重在55到60公斤之间。

She weighs ___between 55 and 60 kilograms.

比赛对6到12岁的儿童开放。

The competition is open to children ___between six and twelve years of age.

这是为18到30岁的年轻人准备的。

It's for young people aged ___between 18 and 30 years old.