It's difficult to pinpoint the cause of the accident.
很难清楚地找到事故发生的原因。
It's difficult to pinpoint a specific cultural reason.
确定一个具体的文化缘由是很难的。
It is difficult to pinpoint when water problems of the modern age began.
很难准确地指出，现代用水的问题是什么时候出现的。
It is difficult to pinpoint when water problems of the modern age began.
很难准确地指出，现代用水的问题是什么时候出现的。
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