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You monkey around with something when you do not know what you are doing.
VOA: special.2011.03.13
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Okay? So when you say that what you're doing is scientific in a context of this sort, you are making yourself vulnerable.
对吧？，所以在这种情况下你说自己所做的是科学的时,你就使自己站不住脚了。
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Use this pattern when you wish to express what you are doing right now.
当你想表达目前你正在做什么的时候，你就可以用这个句型。
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And in one year when he's doing this,he says, "These are the books that you should read and should not read."
有一年他在写信的时候，他写道，“这些是你们该读和不该读的书“
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You might be winded doing it the second way, but when you get to the top and you are at the 60th story your gravitational potential is independent of how you got there.
对于走路你可能很抓狂，但你一旦到了顶层,你就是在第60层,你的重力势能,与你如何到达那里无关。
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So, when I threw that thing up and you caught it, what you are doing mentally was immediately figuring out where it started and at what speed.
所以当你接住我抛出的物体时,你大脑里的反应就是,立刻弄清它的初位置以及初速度
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Intervention studies are when you're actually doing something with people.
进行干预性研究时需要与实验对象有接触
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When you're in a group doing something terribly aggressive and you are not--you don't feel like you're at risk you might laugh and laughter is a signal to other members of your group as a signal of solidarity and what you're doing together.
当你在群体在做具有强烈攻击性的行为时,你不会觉得自己有危险,你会笑,你笑是向其他群体成员传达一个信号,你们团结一致，共同进退。
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When someone comes to us in the elevator in William James , ?" I says, "How are you doing?"
有人走向我们,在William，James大厅的电梯里，我说“你好吗“
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So, usually there are two different methods, when you are doing your homework at UCLA.
其实，在UCLA做作业的时候通常有两种方法。
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There are really two purposes in us doing this: one was so you can get a fix on your own eating, and second you can see the challenges that are involved in assessing what people eat when you start doing studies linking diet to health.
这么做实际上有两个目的,一是你可以调整你自己的饮食,二是当你开始研究,饮食与健康的关系时,你会发现,在对人们吃什么进行评估时存在很多困难
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