once:

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once: WordReference English-Chinese Dictionary © 2009

主要翻译
once	adv	(a single time)	一次 adv yí cì
I have only smoked marijuana once.
我只吸过一次大麻。
once	adv	(formerly)	曾，曾经 adv céng, céng jīng
I once knew how to sew.
我曾经会缝纫。
once	conj	(if ever)	一旦 conj yí dàn
You will want more once you try Thai food.
你一旦尝过泰国菜后，就会欲罢不能。
once	conj	(after, when)	当...的时候，在…以后 conj dāng ... de shí hòu , zài … yǐ hòu
You can pay for it once you get here.
你可以到了这里后再付款。
once	n	(a single time)	一次 n yí cì
Once is enough for me. I have no interest in doing it again.
对我来说，一次就足够了。我没有兴趣再做一次。
针对上面的 "once" 提出改进建议。

复合形式：
all at once			忽然，突然 hū rán, tū rán
at once			立刻，马上 lì kè, mǎ shàng
			同时 tóng shí
just once			仅此一次，只有一次 jǐn cǐ yí cì, zhǐ yǒu yí cì
once and for all			一次了结地，彻底地 yí cì liǎo jié de, chè dǐ de
once upon a time			很久以前 hěn jiǔ yǐ qián

标题中含有单词 'once' 的论坛讨论：

For once
once-daily extended release medicine
there was once hare

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