All of those " um" s, they don't affect the intelligibility of the answer; it's still very easy to understand, it doesn't require more effort on the part of the listener, so I think it's still a level four answer.
所有的这些“嗯”不会影响回答的可理解性;它仍然很容被理解,不需要听众付出更多的努力,所以我认为这仍然是一个 4 分的回答。