We know that mammals, dogs for example, dogs vocalize many different sounds.
我们知道像狗这样的哺乳动物会发出很多不同的声音。
"We still believe in rewarding superior achievements and know that these top students truly value the scholarship," says Scott Friedhoff, Allegheny's vice president for enrollment.
阿勒格尼学院负责招生的副校长斯科特·弗里德霍夫表示：“我们仍然相信奖励卓越成就的做法，我们知道这些优等生真的看重奖学金。”
However, we now know that since oxygen levels were much lower in the Mesozoic than we assumed, there was much less plant life for sauropods to eat than we thought.
然而我们现在知道了，由于中生代空气的含氧量比我们想象的要低得多，所以蜥脚类动物可食用的植物也比我们想象的要少得多。
But really the instrument we know today was the result of a continuing development that started for our practical purposes in the 1920s.
但实际上，我们今天所知道的乐器是在20世纪20年代人们出于实用目的造出来、之后持续发展演变而成的。
Do you remember all years when scientists argued that smoking would kill us but the doubters insisted that we didn't know for sure?
还记得那些年吗？当初，科学家提出吸烟会导致死亡，而怀疑者们却坚持认为我们还不能确认这一点。
Just as on smoking, voices now come from many quarters insisting that the science about global warming is incomplete, that it's OK to keep pouring fumes into the air until we know for sure.
就像吸烟一样，现在来自许多方面的声音坚持认为，有关全球变暖的科学是不完整的，在我们确定之前，继续向空气中排放烟雾是可以的。
We do not even know, for example, how many stars have planets, and we certainly do not know how likely it is that life will arise naturally, given the right conditions.
例如，我们甚至不知道有多少恒星有行星，我们当然也不知道如果有适当的条件，生命自然出现的可能性有多大。
How do we know, for example, that the stars are really huge balls of fire like the Sun and very far away?
比如说，我们怎么知道恒星真的是像太阳一样巨大的火球，而且离我们很远呢？
It might surprise you to learn that restaurants, as we know them, have only existed for a few centuries.
当你得知我们所知道的餐馆只存在了几个世纪，你可能会感到惊讶。
Intrinsically, we all know that whole foods, such as fruit, vegetables, and whole grains are best for us.
从实质上讲，我们都知道天然的食物，比如水果、蔬菜和全谷类是最适合我们的。
We already know that Justin Bieber and a song from Rent are on tap for Glee this season.
我们已经知道贾斯汀·比伯和《吉屋出租》的一首歌都会出现在这一季的《欢乐合唱团》中。
We know that sleep is important for good physical and mental health.
我们知道睡眠质量对良好的身心健康至关重要。
At that moment we think we know what's best for us more than God does.
在那些时刻，我们自以为比神更知道什么对自己是最好的。
For we know that America cannot meet the threats of this century alone, but the world cannot meet them without America.
因为我们知道，美国不能独自面对本世纪的威胁，没有美国，世界也对付不了这些威胁。
Some teachers say that nobody is to blame for their SINS, that we do not know what we do.
有些老师会说，任何人都不应由于过失而受到指责，因为大多数时候我们并不清楚自己在做什么。
We all know that the reasons for failure are multiple-layered and sometimes have nothing to do with psychology.
我们也知道，失败的因素可能是多层次性的，有时根本和心理素质无关。
We automatically think of willpower as a resource we use to help us do the things we know we should do - the things that are good for us.
我们会不假思索地认为，自己的意志力会有助于我们去干那些应该干的事，那些对自己有好处的事。
We know that external assistance for health has more than doubled since the start of this century.
我们知道，自本世纪初以来，外部卫生援助量翻了一倍多。
We know that exercise is good for us. We are convinced of that, but that doesn't mean we are committed to exercise.
我们知道锻炼对自己有好处，对此深信不疑，但是那并不意味着我们要锻炼。
We know that God spake unto Moses: as for this fellow, we know not from whence he is.
神对摩西说话，是我们知道的。只是这个人，我们不知道他从那里来。
We don't know for sure, but we do know that every species that is removed … results in some weakening of the ecosystem.
我们完全不知道，但我们知道，每一种物种的灭绝······结果都是在某种程度上对地球生态系统的削弱。
We also have to know that perfection is only attainable for God — friends will let us down and we will let them down.
我们也必须要知道完美只有在上帝那里能够实现——朋友会让我们失望，同样，我们也会令他们失望。
No, if we admit that notion, then is there anything we can say we know for certain?
不，如果我们承认了这个观点，那是不是就没有任何东西可以说是我们确定认知的了？
But now we know that the outlook for the next couple years at least is slow growth.
但现在我们知道至少在接下来的两年，将会是缓慢增长的前景。
One thing we know for sure is that the British economy will suffer its first recession for 18 years in 2009.
头一件我们可以肯定的事就是英国的经济将在2009年经受18年来的第一次衰退。
But more research needs to be done before we know for certain that TwHF extract works and is safe.
不过，在我们确切地了解雷公藤提取物有效而且安全之前，还需要进行更多的研究。
The only thing we know for sure is that it increases our debt and locks in bigger and bigger interest payments every single year.
我们唯一可以肯定的一点是，它增加了我们的债务而且我们在每一年都会支付更多的利息。
We know that we are fighting for freedom to shape our life according to our own ideas.
我们都知道我们正在为自由而奋斗，根据我们自己的观念来决定我们的一生。
We know that we are fighting for freedom to shape our life according to our own ideas.
我们都知道我们正在为自由而奋斗，根据我们自己的观念来决定我们的一生。
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