直接把moreover去掉，改用A and B are related to each other,so.....建议把那个almost改成nearly。(1) 并列 because 里的两个从句，用最简单的 "and" 就很好。 从句内部用 "moreover" 不大合适。(2) because 引导的是从句，一句话没有讲完，用逗号加小写，后面的是主句。我建议这样翻译：Because the effects of A and B share basically the same chemical mechanism and A and B relate to each other, it is...如果怕不够清楚，可以考虑这样说：Due to the fact that the effects of A and B share basically the same chemical mechanism and that A and B relate to each other, it is...或者：Because of the basically same chemical mechanism of the effects of A and B and the interrelation between A and B, it is...moreover没有改的必要啊；我认为each other后面应该用逗号，然后it就不用大写了
