He had to be certain. There could be no room for doubt.
他必须确定无误。不能有任何的犹疑。
If you want to be certain of getting a ticket, book now.
要想有把握买到票,现在就得预订。
She would break my biscuits in half to be certain I wouldn't choke.
她会把我的饼干掰成两半,以确保我不会噎着。
"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.
VOA: special.2011.03.20
Some of the important figures-- there had to be certain inventions to make it work.
一些重要人物以及,重要的创新推动了保险的发展
but you've got to be certain when you get out there. And make a positive move.
但是你在外面,你必须要小心。然后积极行动。
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