1·He had an extraordinary memory, and when once he got hold of a fact it never escaped him.
他有极强的记忆力，只要他掌握了情况，就从不忘记。
2·At Chinese New Year, when once he would go home to visit his son, Fang must stay behind because the restaurant is so busy.
以前春节，他都要回家看儿子，但今年，他必须留守厨房，因为餐馆生意太好了。
3·He was 12 years old when once entered his grandfather's room to wake him up. But grandfather never opened his eyes and Dauren called his mom.
Dauren 12岁时，有一次到爷爷的房间叫他起床，但爷爷始终闭着眼睛，于是他唤来了妈妈。
4·It is just as easy, when once the mind becomes trained, to think prosperity and abundance and plenty, as it is to think lack, limitation and poverty.
其实很简单，只要你稍微训练一下你的思想，就会发现其实想象富足和财富与想象缺乏局限和贫穷是一样的简单。
5·When once they were in her power, she would feed them well till they got fat, and then kill them and cook them for her dinner; and this she called her feast-day.
当他们一旦进入她的控制，她就会给他们吃的很好直到他们长胖，然后杀掉他们并且用他们做她的大餐；这被她称之为她的盛餐日。
6·A sign of strong character, when once the resolution has been taken, to shut the ear even to the best counter-arguments. Occasionally, therefore, a will to stupidity.
性格坚强的一个迹象是，一旦下了决心，即使对最有说服力的反对意见也充耳不闻。因而有时也就是一意孤行地要做蠢事。
7·Megan didn’t know this when once, in aheroic, or perhaps exhausting attempt to impose time-outs, Megan sat Ryan on achair and then physically restrained him for the three minutes.
梅根对此并不了解，有一次不知是出于狠心，还是出于无奈，她试图对儿子实施强制隔离。 她让赖安（Ryan）坐在椅子上，然后按着他在椅子上待了三分钟。
8·Once when we were going to Paris, I forgot my passport.
有一次我们去巴黎时，我忘了带护照。
—— 《柯林斯英汉双解大词典》
9·Once or twice I heard her muttering, but when I said, "Sorry? What did you say?" she didn't respond.
有一两次我听见她在嘀嘀咕咕，但当我说“抱歉? 你说什么？”时，她没有回答。
—— 《柯林斯英汉双解大词典》
10·Once, when I was on my way back to my hometown, I lost my purse without even knowing it.
有一次在我回家乡的路上，我把钱包弄丢了都不知道。