一个常见的问题是由孔的边缘不整齐或者纸带不干净所引起的。

A typital problem is caused by the ragged edges of the holes, or by dirt on the tape.

youdao

这样明显不干净的地方你还要去吃，还把问题算到我们学校头上。

So obviously you do not have a clean place to eat, we also question the school head count.

youdao

我自从青少年以来，就一直是属于问题肌肤。我的皮肤非常的敏感，并且对于不干净的杂质很容易就有过敏的反应。

I had always a problematic skin since my teenage years. It is very sensitive, reacts quickly with allergic reactions with impurities.

youdao