She is currently rated number two in the world.
她目前排名世界第二。
The two groups of children have quite different characteristics.
这两组儿童具有截然不同的.特点。
The child disappeared from his home some time after four.
这孩子四点多的时候就离家不见了。
She asked her students to get into groups of four.
她让学生每四人分为一小组。
First get students to form groups of four.
首先让学生分成四人一组。