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- Once we intro?duce metaclasses, we can finally declare the selector for a dynamically linked method where it belongs: in the same interface file as the metaclass pointer. 一旦引入元类，我们终于能在元类指针所在的同一接口头文件里声明动态连接方法专有的选择器。
- Once we've fixed the computer, it will be plain sailing. 等我们修复了电脑,一切就会顺利的。
- Once we have studied it,we can push people forward. 我们有了研究，就能推进发展。
- Once we caught him dozing off in class. 有一次我们发现他在上课时打盹。
- Once we start, we should go the whole hog. 我们一旦开始干，就应该干到底。
- Once we left the trail the going was rough. 一旦我们离开路径，路面就变得崎岖不平
- For once we heard a loud noise so we stood at once. 有一次我们听到一声巨响,都立刻站了起来。
- We'll let you know once we've come to a decision. 有些会说得实在一点
- It collapsed instantaneously once we left Vietnam. 我们一撤出越南，它马上就土崩瓦解了。
- Once we sat in here, waiting daybreak! 曾经我们坐在这里,等待黎明!
- I remember once we went to see an open-air movie. 记得有一次去看露天电影
- For once we were all in agreement. 就我这一次完全达协议。
- Once we break even, the rest will be gravy. 一旦我们收支相抵,剩下的部分就是外快了。
- Once we, too, were foolish and disobedient. 我们曾经是如此地愚蠢和不顺从神的旨意。
- Once we dreamt that we were strangers. 有一次，我们梦见大家都是不相识的。
- Where once we watched the small free birds fly. 我们曾经在那里看著自由的小鸟飞过。
- Most of the profits are swallowed up by the mortgage. Once we've got that paid off I'll feel we've turned the corner. 房产抵押中耗尽了大部分利润，一旦抵押款偿清，我们就渡过了难关。
- Once we were part of a caravan of twelve thousand camels. 我们曾和一支有一万二千头骆驼的商队一起行进。
- Once we stood outside in a blinding snowstorm for half an hour. 我们有一次在令人眩目的暴风雪中站了半个小时。
- At once we hear the drums and the squawk of trumpets. 我们便立刻听到了鼓声和刺耳的喇叭声。
