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For all the disadvantages, it has its compensating advantages. Like anything else, it has its faults. A and B has several points in common. A bears some resemblances to B. There is sufficient evidence to show that ... According to statistics proved by ..., it can be seen that ... The same is true of B. Wondering as A is ,it has its drawbacks. It is true that A ... , but the chief faults are ... A number of factors are accountable for this situation. A number of factors might contribute to the phenomenon. The answer to this problem involves many factors. The phenomenon mainly stems from the fact that... The advantage far outweigh the disadvantages. Another contributing factor is ... Perhaps the primary factor is that But the fundamental cause is that ... The advantages of A are much greater than those of B. A may be preferable to B, but A suffers from the disadvantages that... However, the same is not applicable to B. People used to think ..., but things are different now. The factors that contribute to this situation include... | 
