第六类问题给出很少信息，实际上不给出信息。
The last problem type has very little information that's is given, in fact, there is none.
该凝胶作为第六类应用而用于自第15日开始的其他日子。
The gel was used on alternate days starting on day 15 for 6 applications.
也可以有这样的第六类问题，即在解决问题之前，给出具体的问题情境。
Or you can have a type 6, that is a problem situation that has to be defined before it's solved.
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