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。
Sometimes his English letters were so poorly composed that they were hard to read, a common problem among dyslexics.
其实上述情况是读写困难孩子的一个常见问题。
It is a common problem faced by many Chinese businesses, and can be particularly hard on small, family-run firms that cannot afford to hire a PR firm to protect their reputation.
确实，网络舆情控制是中国企业普遍面对的问题。而对那些规模较小、无力雇佣公关公司家庭企业而言，这个问题尤为困扰。
The author realizes a fast and large capacity storage system using common hard disk to record and gives an answer to the problem of storage of large data in portable instruments.
在此基础上，给出了数据高速流盘的思想和方法，实现了利用硬盘作为存储载体的高速大容量数据存储系统，解决了便携式系统大容量数据存储的问题。
It has been proved the computation of minimal reduction and full reduction both is NP-hard problem, in artificial intelligence the common way is to employ heuristic knowledge to reduce.
研究表明，最小约简的计算和全部约简的求算都是NP问题，在人工智能中，解决这类问题的一般方法是利用启发式信息进行约简。
Developing rock roadway of coal mine is a hard task at present. Mechanized drivage of rock roadway has become a common technical problem of every coal mine.
目前煤矿岩巷开拓任务重，岩巷机械化掘进成为各矿普遍存在的技术难题。
Developing rock roadway of coal mine is a hard task at present. Mechanized drivage of rock roadway has become a common technical problem of every coal mine.
目前煤矿岩巷开拓任务重，岩巷机械化掘进成为各矿普遍存在的技术难题。
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