社会学的三种主要理论各有优势，但也存在不足之处。
Each of the three main theories of sociology has its own advantage and disadvantage.
目前，内结构设计的通用软件PKPM在计算井字梁的问题上存在不足之处。
At present, the internal generic software for structure design PKPM has some deficiency in calculating cross beam.
通过一个实例说明均衡度的定义存在不足之处，由此引出关于均衡度定义的修正方案；
Some imperfect aspects in the definition of balance degree introduced in the literature are explained.
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