This problem is more obvious and thus easier to detect, but difficult to explain.
这个问题更加明显一些并且比较容易检测，但却很难解释。
This time-lag is difficult to explain, but there are three.
这种时滞现象很难解释，但可能有三个原因。
This is not an objective definition, it is difficult to accurately explain in words.
这也没有一个客观的定义，很难用语言来精确说明。
This time-lag is difficult to explain, but there are three possible reasons.
这种时滞现象很难解释，但可能有三个原因。
This phenomenon is difficult to explain.
这一现象难以解释。
This phenomenon is difficult to explain.
这一现象难以解释。
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