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And the only way you'll know for sure is to jump in with both feet.
你心里知道的就是，你需要迈过这道坎。
《Gossip Girl Season 1》《绯闻女孩 第一季》
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Letty's dead, Dom. I need to know for sure. Then I'm going with you.
莱蒂已经死了，唐。我需要搞清楚。我和你一起去。
《Fast and Furious 6》《速度与激情6》
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When you do that, let me tell you what I know for sure: That's when your story gets really good.
届时，我会确信地告诉你：那时，你的人生才会变得真正精彩起来。
《Oprah Winfrey Speech at Harvard》《奥普拉演讲》
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Look, she only suspects something okay? She doesn't know for sure, so just throw her off the track.
她只是在怀疑，又不是确定，你可以唬她。
《Friends Season 6》《老友记 第六季》
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So anybody who's here today with your significant other, just turn over to them and swab their mouth, send it to the lab and you'll know for sure.
谁今天是和你重要的另一半一起来的，只要转过去，刮下他／她的口腔寄到那个实验室你就知道了。
《TED: Genomic revolution》《TED：欢迎进入基因革命时代》
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And then you'll know for sure that you finally found a broker on Wall Street that you can trust, and who can consistently make you money. Sound fair enough?
然后你就可以确信，你总算在华尔街找到了一个能够信赖的经纪人了，一个能不断帮你赚钱的人，听起来怎样？
《The Wolf of Wall Street》《华尔街之狼》
双语例句
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We'd probably know for sure whether someone was shooting at the president from that famous grassy knoll.
我们可能确定是否有人正在从那个著名的草地山丘草地上向总统射击。
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Well, I don’t know for sure either.
我也不知道。
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However, we don't know for sure.
然而，我们仍然不能确信。
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But Idon \ 't know for sure.
但我也不敢肯定。
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We may never know for sure.
我们可能永远无法确定。