A.
生活在澳大利亞沙漠的中心要面臨一些問題,其中重要的一個就是取水問題.
not least of =not the least of = a phrase used when you are giving an important reason for something,or an important example of something 部分的;尤其(用于陳述重要理由或舉出重要例子)
含最高級的否定比較句最常見的就是not the least of這一結(jié)構(gòu),常譯為“其中重要的一個”,
There were several reasons for dismissiqg him from his post,not the least of which was his neglect of duty．撤消他的職務(wù)的理由有幾條,其中重要的一條是他玩忽職守.
LZ問的句子與以上例句句型類似.