但我们也知道这些挑战可以被克服。
但我们也知道，我们在挽救生命。
但我们也知道，不采取行动将对美国人民的就业机会、储蓄和退休造成严重的后果。
But we also know that failure to act would have grave consequences for jobs, for savings and retirement for the American people.
我们都知道在睡眠时记忆会得到加深，但我们也知道多看几个小时的书裨益绝对不小。
We know that memory consolidation can occur in sleep, but we also know that those extra hours studying can do some good.
在不要毁掉死海这一点上我们的确有共同利益，但我们也知道我们的利益是不同的。
We have a common interest in not destroying the Dead Sea. But we know where our interests diverge.
这座纪念碑是他们的力量和勇气的见证，我们深深地怀念他们，但我们也知道他们长眠在一个更好的地方。
This monument attests to their strength and their courage, and while we miss them dearly, we know they rest in a better place.
虽然我们今晚站在这里，但我们也知道有勇敢的美国人在伊拉克的沙漠里和阿富汗的山脉里站岗，为国家冒着生命的危险战斗。
Even as we stand here tonight, we know there are brave Americans waking up in the deserts of Iraq and the mountains of Afghanistan to risk their lives for us.
但我们也知道，尽管我们这样做，尽管我们履行了我们作为父母的责任，尽管华盛顿也做好了自己该做的，我们在生活中仍要面对许多艰难的挑战。
But we should also know that even if we do; even if we meet our obligations as fathers and parents; even if Washington does its part too, we will still face difficult challenges in our lives.
他们确实狩猎，也会种植粮食作物、饲养绵羊，但我们不知道为什么有这么多画与狩猎相关。
They did hunt and they also raised cereal crops and kept sheep, but we don't know why so many of the paintings are of hunting scenes.
我们知道它们在管上涂抹了一种液体，但我们不知道它们从哪里分泌出这种液体，也不知道它的化学成分是什么。
We know they smear a liquid on the tube, but we don't know where they secrete it from or what its chemical composition is.
生于美国的艺术家南希·巴尔说：“我知道印度感到不快，但我们还是觉得这所故居找对了卖主，心里也很激动。
Nancy Ball, a US-born artist, said: "I know India has responded not too happily but we think it went to the right people and we're delighted.
她说：“我们知道存在哪些问题，我们也知道解决办法，但我们不能开发软件程序。”
"We can describe the problems and we can make sure software solutions get used, but we can't develop software solutions," says Bucknall.
我知道，这一愿景不可能在一年内实现，甚至不可能在数年内实现，但我也知道我们必须开始，我们每一个人都为实现这个愿景承担着责任。
I knew that this vision would not be fulfilled in a single year, or even several years. But I knew we had to begin and that all of us have responsibilities to fulfill.
他们回答：，我们也知道，但我们想没准我们可以坐下来，一起想想有没有什么办法开一家新的公司。
And they said: "we realized that, but we thought maybe we could sit down and together come up with something that you could start a company."
我不知道为何这些认知会在我脑海中浮现，但我想我们也可向许多作家和演说家问同样的问题，到底哪种人才真正清楚自己的所知与无知？
I don't know why this insight showed up in my brain. But I guess we could ask the same of many authors and speakers. Who is this one or that one to know what they know?
我们现在处于这样一个境地，使我们必须严肃对待碳移除选项，但我们也不支持太阳辐射管理，因为我们同样也不知道这么做的风险。
'we are in a position now where we have to seriously look at the carbon removal option, but we don't support solar radiation management because we just don't know enough about the risks.
但我们从来不为此担忧，因为我们从表面上看不到结果，也不知道它们正在对我们的血液做什么。
We didn't worry about it because we weren't seeing the effects on the outside. Little did we know what it was doing to our blood.
虽然现在我们还不知道确切数据，但我们相信员工剪短发后就不用花太多时间用吹风机，水量的使用也会减少。
We are not sure of the data yet, but we believe if people have short hair they do not need to use their hair driers for so long and they will use less water.
我不能指责你们的决定但我希望你们理解，我们的国家面临着无数的难题，我也知道我们会为你们提供这样或那样的帮助。
I can't blame you for what you have decided but I hope that you could understand. Our country is now in a sea of problems. And I know for sure that we helped you in a way or another.
我知道你指的是什么，这些谣言我们之前也听说过一些，但我们几乎与大家同时知道苹果的新计划。
We had heard the same rumors that you had, so we knew what the rumors were. But we heard about Apple's plans pretty much at the same time as everyone else.
我们希望最好别这样，但我们也永远无法知道她究竟会做出什么选择。
So might she give up her fabulous glamorous life for something more normal in the near future? We hope not, but you never know.
他说：“我们需要让他们知道，我们也许会给他们食物的援助，但我们不会永远给他们援助，他们也必须为他们自己的家庭和未来干活。”
He said: "we need to show them that we may be giving them food but we will not be giving it all the time. They also have to produce something for their families and the future."
我们现在处于这样一个境地，使我们必须严肃对待碳移除选项，但我们也不支持太阳辐射管理，因为我们同样也不知道这么做的风险。
'we are in a position now where we have to seriously look at the carbon removal option, but we don't support solar radiation management because we just don't know enough about the risks.'
但我也知道，他只是我们中普通一员。
注意，该Web服务是用Delphi实现的，但我们不知道(也不关心)Web服务在什么地方，或者它运行在什么操作系统上！
Notice that the Web service is implemented in Delphi, but we have no idea (nor do we care) where the Web service is located or what operating system it is running on!
我们把他手脚上的绳子解了下来。但我们不知道期望他做些什么，也不知道他会做出什么可怕的事情。
We took the ropes from his hands and feet. But we knew not what to expect of him, what fearful thing he might do.
类似地，在过去的30年里，像我们知道的多溴二苯醚(PBDEs)等阻燃化学药剂也被广泛应用，但我们并不了解它们具有的其他功能。
Similarly, over the last 30 years flame-retardant chemicals known as polybrominated diphenyl ethers (PBDEs) have been widely used, although little is known about their broader effects.
类似地，在过去的30年里，像我们知道的多溴二苯醚(PBDEs)等阻燃化学药剂也被广泛应用，但我们并不了解它们具有的其他功能。
Similarly, over the last 30 years flame-retardant chemicals known as polybrominated diphenyl ethers (PBDEs) have been widely used, although little is known about their broader effects.
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