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  精子的分布具有不均匀性，其分布毫无规律，十分散乱，精子的游动方向各不相同，其尾部有的张开，也有的和头部重合，且背景以灰色为主，还有白色等混杂的颜色。本题要求在这样混杂的二十五张图片中求出每张图内所含的精子数目。(The distribution of sperm is not uniform, its distribution is irregular, very scattered, the swimming direction of sperm is different, some of its tail is open, some coincide with the head, and the background is mainly gray, there are mixed colors such as white. In this question, we need to find out the number of sperm in each of the 25 mixed pictures.)