您要查找的是不是：
- Opportunity knocks but once. 机不可失，时不再来。
- Opportunity knocks but once. The early bird gets the worm. 机不可失,时不再来,我应捷足先登。
- Opportunity knocks but once 机不可失, 时不再来
- Opportunity knocks at the door only once. 机不可失,失不再来。
- Luck is when opportunity knocks and you answer. 运气就是你对降临的良机的回应.
- Dad often says that opportunity knocks only once, so one must take it when it comes. 爸爸总说机不可失、时不再来，有了机会一定要把握住。
- I made slow time down the steps but once on the flat I was all right. 我慢慢地下着楼梯，但当我一踏上平地时，我就不要紧了。
- But once this opportunity came, the consequences would be far reaching. 但是一旦机遇来临，后果将影响深远。
- I hope to get a better position. If opportunity knocks, I will take it. 我希望能获得一份更好的工作,如果机会出现了,我会抓住。
- I have written but once since I came here. 自从我来到这儿以后，我只写过一回信。
- I never lived amongst fine people but once. 我只在时髦的人们中间生活过一个时期。
- But once again a reference is being passed. 但同样地，实际传递的是一个句柄。
- The wise man is deceived but once,the fool twice. 智者只上一次当，愚人可上二次当。
- I am alway hoping to get an offer of a better position. If opportunity knocks, I will take it. 我总是希望能获得一份更好的工作,如果机会来临,我会抓住。
- Well, I am hoping to have an offer of a better position.If opportunity knocks, I will take it. 回答的时候不能上你的上一份工作有多么的不好,而是要从个人发展的角度入手。
- Just my luck. But once I'm out of the fortress. 我真走运,不过一旦我从要塞里面逃出来。
- A: Well, I am hoping to get an offer of a better position. If opportunity knocks, I will take it. 我希望能获得一份更好的工作，如果机会来临，我会抓住。
- But once again I cannot rule out that possibility. 然而,我也不能完全排除这个可能性。
- Well, I am hoping to get an offer of a better position. If opportunity knocks, I will take it. 我希望能获得一份更好的工作，如果机会来临，我会抓住。
- Well,I am hoping to have an offer of a better position.If opportunity knocks,I will take it. （回答的时候不能上你的上一份工作有多么的不好，而是要从个人发展的角度入手。）
