答：least原级是little，little的比较级是less，而least是没有比较级的。
least adj. 最少的；adv. 最低程度地；n. 最不重要的事物；pron. 最少量
例句：Aim to have at least half a pint of milk each day.
目标是每天至少喝半品脱牛奶。
About two-thirds of adults consult their doctor at least once a year.
大约三分之二的成年人一年至少看一次医生。
短语有：
at least 至少 ; least chub 阴河鱼；least common multiple 最小公倍数
in the least 一点 ; Least Significant Bit [计] 最低有效位
Least Fixed Point 最小不动点；least developed country 最不发达国家
principle of least action 最小作用量原理 ; 最小酌原理
not in the least 毫不 ; 一点也不
little adj. 小的，比较小的；det. 少量的；adv. 极少；pron. 少许
例句有：I had little money and little free time.
我没什么钱，也很少有空闲时间。
I find that I need very little sleep these days. 我觉得我现在需要的睡眠很少。
短语有：The Little Mermaid 小美人鱼 ; Little Women 小妇人
little finger 小手指 ; Little Dorrit 小杜丽 ；little by little 逐渐地
less adv. 更少地，程度较低地 ;det. 较少的，更少的; pron. 更少
People should eat less fat to reduce the risk of heart disease.
人们应该少吃脂肪以减少患心脏病的风险。
Borrowers are striving to ease their financial position by spending less and saving more.
借款者都在努力通过少花多存来缓解经济紧张状况。
less than 小于；less is more 少即是多 ; no less than 不少于 ;
Not One Less 一个都不能少 ; much less 更不用说 ; no less 仍然
no less than 不少于；less and less 越来越少；
同根词：lesser 较少的；lessening 减轻；lessening 减少；lessen 使…变小
