我认为在需要进行认证的领域有丰富经验的IT专业人员没有必要参加(尽管参加这些课程十分有用)。

I believe IT pros experienced in the area in which they are testing do not (although a course is always useful).

youdao

所以，我认为正确熟悉和理解什么是活动课，就显得十分有必要。

So, I think what to be known correctly and understand is mobile class, appear very be necessary.

youdao