But in certain circumstances, both can let us down.
但是在特定的情况下，它们又都能使我们犯错误。
They ought to win easily today, but nothing in life is certain.
他们今天应该能轻而易举地取胜，但世事难料。
Now this can be a great thing in certain circumstances, but not all the time.
现在，在某些情况下鲁莽还不错，但并不是每时每刻都行。
It is not true security, but it can be useful in certain contexts.
这并不是真正的安全，但该方法在某些情况下很有用。
But silver can also accumulate in the environment and, at certain levels, prove toxic.
但银同样也会在环境中积累，当其达到一定浓度时将有毒性。
Not just any promotion, but that certain level in the corporate ladder where everything will be better.
不仅仅是任何晋升的机会，你可能仅仅想在公司的“阶梯”中处于某种高度，可能一切就会好起来。
But no one seems certain where Americans should go next in space.
但似乎无人确定美国人在太空下一步去哪里。
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。
FLATOW: But it has changed in different directions, a certain amount.
伏拉汤姆：但它在不同的方向有一定量的改变。
But two things are certain in the battle of the books.
但在这场圣书之战中，有两点可以肯定。
Its new global champions have built successful businesses, but only in certain industries.
它的新一代的全球征服者们在商业方面取得的成功也仅仅局限在一些领域里。
Sure, some universities specialize in certain subjects, but the level is about the same.
当然某些大学会专攻某一学科，但是水平都是差不多的。
In fact, the more simple game, but also need players know certain game skills.
其实越是简单的游戏，它就更是需要玩家们懂得一定的游戏技巧的。
I hope I'll make it, but nothing's certain in this world.
我希望我能达成这个目标，但在这个世界上什么都不好说。
Such conduct may pass in certain circles but cannot be to tolerated here.
这种行为在某些圈子里也许没有问题，在此地却不允许。
But in view of certain evidence, I had to wonder: Are we the new bachelors?
但在某方面我不禁纳闷…我们是新单身贵族吗？
But I am really certain that either team will do absolutely everything in their power to make sure they can remain at the top.
但我真的确信，两支车队都会全力确保他们能留在巅峰。
They contain some new ideas in certain respects but are yet not perfect.
它们在某些方面有一定的新看法，但还不完善。
Hearing the fire alarm, get out of the house quickly but in a certain order.
听到火警时，迅速而有序地离开房子。
But in a certain period of time the husband very loved his wife.
某段时间丈夫对妻子疼爱有加。
But the newspaper only reaches a certain clientele, especially those right in the city.
报纸只送到一部分客户手中，特别是这个城市里的客户。
But the newspaper only reaches a certain clientele, especially those right in the city.
报纸只送到一部分客户手中，特别是这个城市里的客户。
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