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- I once believed, all things worth to be believed, I have known in Cambridge. It is gone in my travelling. What isn't my imaged, but benefited to me much. 我曾相信，所有值得知道之事，我在剑桥都知道了。在我旅行的过程之中，这一想法逐渐消失了。这与我本意相反，但是却对我非常有益。
- I once believed. 曾经我相信。
- The story reminds me of an experience I once had. 这个故事使我想起我的一次亲身经历。
- It was once believed that light waves traveled through the ether. 人们曾经相信光波在以太中穿过。
- A stone once believed to be impenetrable in its hardness. 硬石，金刚石一种曾被认为在硬度上不可穿透的石头
- I once saw a man tear a telephone directory in half. 我有一次看见一个人把电话簿撕成了两半。
- Contagion is not so easy as once believed, either. 接触传染也不如一度认为的那样容易。
- I once read a book call "the call of the wild", but that's beside the question. 我曾读过一本书，叫《野性的呼唤》, 不过这与本题无关。
- I once brought a fellow to that was drowned. 我有一次曾经把一个溺水的人救活。
- It was once believed that light wave traveled through the ether. 人们曾经相信光波在以太中穿过。
- I have relaxed some standards I once had. 我是从以前的立场后退了。
- Actually,I once though of ringing you,but I didn't. 其实，我曾想到过给你打电话，但没打。
- Well,I once did a bit of waiting. 是的，我曾经做过一段时间的侍者。
- I once took off standing,just for a bet. 有一次，我在飞机起飞时站立着，那只是因为与人打赌。
- A tropical fever once believed to be caused by the heat. 中暑一种炎热感冒，一度被认为由受热而引起
- When I was small, I once read a jingle. 我小时候念过一顺口溜
- Mental illness develop much earlier in life than once believed. 患精神病的时间比一度所认为的要早得多。
- Mental illness develop much earlier in life than once believed . 患精神病的时间比一度所认为的要早得多。
- I'm not as light on my toes as I once was. 我已经不像从前那么高兴走动了。
- You remind me of a girl, that I once knew. 使我想起一个我曾经认识的女孩。
