Confusing comparison and variation:只对比了一部分的变化or vice versa.

In the argument the author provides the variation in ...to illustrate that ...Although the variation in ...could partly prove that ... however, we all know that to demonstrate ...the comparison between A and B is actually more convincing and necessary.: (the comparison between those entities could be more convincing in illustrating the conclusion ) Lacking comparison between ... we could not assess if ...

Incomplete comparison/exparte information:

14, Unrelated concepts:偷换概念

In illustrating the assumption that ...the author commits a fallacy of hasty generalization.: The author cites A to prove B, however, A is not a good indication of B. (there are basic differences between A and B, thus A could not be properly used to illustrate B ) The author ought to make careful and clear differentiation between A and B before we could evaluate if the inference that ...is justified.