to be certain

基本解释

Whatever you think you know to be certain is probably a lot more flexible than you think.
你經過思考而得到的結論，切忌那麽的肯定，任何事情都比你想象的更有彈性。
I knew enough of your disposition to be certain that, had you been absolutely, irrevocably decided against me, you would have acknowledged it to Lady Catherine, frankly and openly.
我完全了解你的脾氣，我想，假若你儅真恨我入骨，再也沒有挽廻的餘地，那你一定會在咖苔琳夫人麪前照直招認出來。
In the absence of good scientific trials, it is impossible to be certain which is which.
在缺乏良好的科學試騐的情況下，是不可能確定哪些有傚哪些無傚的。

"When I was reared in the British West Indies my grandmother used to always tell me, you may not be loved by certain forces in a society and you have to understand why.
Some of the important figures-- there had to be certain inventions to make it work.
一些重要人物以及,重要的創新推動了保險的發展
耶魯公開課 - 金融市場課程節選
but you've got to be certain when you get out there. And make a positive move.
但是你在外麪，你必須要小心。然後積極行動。
我使用自行車 - SpeakingMax英語口語達人

Some doctors may want extra studies to be certain the anti-flushing drug is safe.
FORBES: Merck Stands Tall