of后加什么动词

　　In school, he was not one of the achievers.

　　上学时他不属于拔尖的那类。

　　The two groups of children have quite different characteristics.

　　这两组儿童具有截然不同的特点。

　　The project is still causing him a lot of problems.

　　这项工程现在仍然给他带来许多的麻烦。

　　The need to communicate is a key characteristic of human society.

　　需要交流是人类社会最重要的一个特征。

　　The new test should aid in the early detection of the disease.

　　新的化验应该有助于早早检查出这种疾病。