一t是little的'最高级，作副词和形容词来用
It happened just when I least expected it.
二t+形容词或副词，构成的最高级是“最不XXXX”的意思
is the least expensive method.这是最不费钱的方法
has not the least experience.她毫无经验。注意not the least是“丝毫无XXX”的意思
三.名词least常用用法
1.A has little, B has less, and C has the least.甲没有多少，乙更少，而丙是最少的。
is not in the least touched.他一点也没被碰伤。
should at least tell me. 你至少该告诉我啊。 at least=至少