Not the least

not least of =not the least of = a phrase used when you are giving animportant reason for something, or an important example of something部分的;尤其(用于陈述重要理由或举出重要例子)
含最高级的否定比较句最常见的就是not the least of这一结构，常译为“其中重要的一个”，如：There were severalreasons for dismissiqg him from his post．not the least of which was hisneglect of duty．撤消他的职务的理由有几条，其中重要的一条是他玩忽职守。
再如： Trade has been bad, not least because of the increased cost of raw materials. 生意一直不好，一个重要原因是原材料涨价了。