他们辩证地分析了这个议题，通过正反两面的讨论找到了最佳解决方案。

They examined the issue ___dialectically, weighing pros and cons to find the optimal solution.

社会变革往往是通过矛盾的对立统一辩证地发展的。

Social change often progresses ___dialectically, through the clash and resolution of opposing forces.