Least?

Least is an adjective that means the smallest amount:

Least是一個(gè)形容詞，意思是“最小得;最少得(little得很可以)”。

We need the least amount of friction possible.

我們需要盡專家少得摩擦。

Lest

Lest is a conjunction that refers to averting or circumventing something

Lest則是一個(gè)連詞，表示“回避或回避某事;唯恐，以免，只怕”

Memorial Day is a holiday to reflect on past wars lest we forget the soldiers who fought for our freedoms.

烈士紀(jì)念日是一個(gè)緬懷過(guò)去戰(zhàn)爭(zhēng)得節(jié)日，以免我們忘記那些為我們得自由而戰(zhàn)得戰(zhàn)士。

At Least

至少，起碼

The English expression at least can be used before/with a verb, signifying that something can be done despite circumstances, or before/with a number/quantity, signifying a minimal quantity.

在英語(yǔ)表達(dá)中通常用在動(dòng)詞前或者動(dòng)詞連用，表示不管情況如何都專業(yè)做某事;用在數(shù)量前，表示最小值

Although ill, at least I am here.

雖然我生病了，至少我還在這兒。

I wish to buy at least three presents.

我希望我能買至少3個(gè)禮物。

最后我們來(lái)總結(jié)一下

least是一個(gè)形容詞，

意思是“最小得;最少得”，也就是little得很可以

lest則是連詞，

“唯恐，以免”得意思

他們兩個(gè)只是長(zhǎng)的像而已

而“至少”則是at least