一经的英文：
once

参考例句：

The drink helps produce saliva and slake thirst, and keeps you a cool head and refreshment. Once tried, yearn forever.
本饮品生津止渴，提神醒脑，一经品尝，终生爱之。

The group's debut album was immediately acclaimed a hip hop classic.
这个组合的首张专辑一经推出便被盛赞为嘻哈乐的经典之作。

sar Borgia soon found purchasers for their appointments
这事一经确定，凯撒·布琪亚不久就又找到了出钱买红衣主教手下官职的人。

Initial investigation at the first sign of emergence of a new zoonotic disease must focus on practical characteristics
人畜共患病浮现的最初迹象一经觉察后所进行的初步调查研究，必须集中在一些实用特征，

Once a reorder is authorized, generate reorder sends necessary data to the Supplier, who ships the items to the store
订货单一经核准，GENERATE reorder(产生订货单程序)就向SUPPLIER(供应商)发出需要的数据，供应商就把货运送到商店。

A text is often changed here and there when it is copied.
原文一经抄写，便常有更改。

This contract will come into force as soon as it is signed by two parties.
合同一经双方签订即生效

This Letter of Guarantee should be returned to our Bank after its expiration.
本保证函一经到期,应退还我们。

Once the price had been agreed,a deal was quickly concluded.
价格一经商定,交易很快就达成了.

Once the design problems were solved, everything was plain sailing.
设计问题一经解决，就容易办了。

once是什么意思：
adv. 一次，一回；一度；曾经
conj. 一旦；一…就…
n. 一次；一回

Once is no custom
一次不成例

Do it for this once.
就干这一次吧。

Gordon is at once modest and clever.(at once …and…既..又)
戈登既聪明又谦逊

This is the leap once of process of cognition.
这是认识过程的一次飞跃。

Slavery was once socially sanctioned.
奴隶制曾经为社会所认可。