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。
They'll have to give up completely on certain of their studies.
他们将不得不完全放弃某些课程。
Certain of those present were unwilling to discuss the matter further.
某些在场的人不愿意进一步讨论这个问题。
I am certain of it, especially if it's difficult for a competitor to copy.
我对此非常确信，尤其是当竞争对手很难抄袭的时候。
Time has winnowed out certain of the essays as superior.
历经岁月的淘洗，有些文章成为经典。
You'll have to leave soon to make certain of getting there on time.
你得快点出发，好确保准时到达那里。
But nobody can be certain of the outcome.
但是，谁也不确定这就是结局。
He is by no means certain of victory yet.
Mugabe先生大选的胜利决不是确定的。
Do not feel absolutely certain of anything.
凡事不要抱绝对肯定的态度；
Certain of it, that is, until I read that blog post!
我一直这样的肯定，直到我看到了这篇博客。
So therefore, I can at least be certain of those.
因此，至少那些我是能够确认的。
What is it that makes me certain of my own existence?
是什么让我确定自身的存在呢？
China needs to be certain of having a nuclear second strike.
中国需明确无疑地拥有二次核打击能力。
That's what faith is, being certain of something we don't see.
这就是信心，信心就是确定我们没看见的事情必会然发生。
A certain of sadness, pain or worries is essential to everyone.
一定的忧愁、痛苦或烦恼，对每个人都是时时必需的。
They had been summoned by the endangered moon: I was certain of that.
她们是被危难中的月亮召集而来的：我肯定这一点。
But the company can at least be certain of some things in the coming years.
但是，耐克公司至少可以确定公司未来几年的美好前景。
She is ready to go into battle, "with the poetry we know how to write", certain of their victory.
她准备去战斗，“用我们会写的诗歌”，一定会胜利。
It became fashionable to eat certain kinds of fish.
吃某些种类的鱼变得时髦了。
The stores are sometimes sold out of certain groceries.
这些店铺的某些杂货有时会脱销。
People of higher status tend more to use certain drugs.
社会地位较高的人更倾向于使用某些药物。
As the years passed he felt trapped by certain realities of marriage.
随着岁月的流逝，他感到受困于某些婚姻的现实情况。
It is the responsibility of every government to uphold certain basic principles.
每个政府都有责任维护某些基本原则。
Certain characteristics of American society help to explain this remarkable migration.
美国社会的某些特点有助于解释这种显著的移民现象。
But sometimes certain species of birds do the exact opposite.
但有时，某些种类的鸟类却会做出相反的举动。
Apple might decide to forbid certain types of speech all on its own.
苹果可能会决定完全禁止某些类型的言论。
We all have a certain image of ourselves.
我们都对自己有一定自我形象。
They should explain how certain type of behavior was not appropriate.
他们应该解释，为什么某些行为是不合适的。
They should explain how certain type of behavior was not appropriate.
他们应该解释，为什么某些行为是不合适的。
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