例句：
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。
Personal characteristics, such as age and sex are taken into account.
个人的'特征，如年龄和性别等，都要考虑进去。
The two groups of children have quite different characteristics.
这两组儿童具有截然不同的特点。
Physical characteristics are determined by genetic inheritance.
身体的特征取决于基因遗传。