When you get into the details of a problem, it is quite common to discover that things you thought would be hard are easier than expected, and vice versa.
详细考虑一个问题时，常常会发现有些本以为困难的事情实际上却更容易，有些本以为容易的事情实际上却更困难。
Scientists who study drug addiction have a common problem: The individuals they deal with are already addicted, so it's hard to tell what, if any, behaviors led to the initial dependence.
研究药物成瘾的科学家都会碰到同一个问题：他们的研究个体已经对药物成瘾，因此很难说得清到底是哪个行为导致了最初依赖性的形成。
But in the judicial practice, it's hard to quote for parties, and the problem of the lack of collecting evidences is pretty common, the justness of litigation is difficult to realize.
但司法实践中当事人举证困难，缺乏收集证据手段的问题却相当普遍，诉讼公正因此而难以实现。
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