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。