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The National Association for Sport and Physical Education says twenty to thirty students in a P.E.class should be the limit.
VOA: special.2009.08.06
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Right add to it in a second, but the idea is class is going to be a template for creating instances.
对象的实例的模板,现在，这真是一个很蠢的模板，我马上会去完善它,但是首先我应该先建立起它来。
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There's a line that I'm going to be developing, pushing, if you will, or defending in this class.
我用一条线来表示，如果你愿意推动或者保护这个课题。
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So, this will be a little bit more like a seminar to start with, and a little bit less like a lecture in class.
所以着看起来有点像是讨论课，而不是讲课。
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It sounds like too obvious even to be worth stating in class, so let me now try and shake your faith a little bit in this answer.
这个道理太很明了甚至不值得讨论,那我们来看看到底是不是这样的
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As we'll talk about later in the class, the biodiversity has shrunk so what used to be hundreds of varieties of corn is now just a few.
像我们后面所要提到的,玉米种群的生物多样性已经从曾经的,几百种减少到了现在的几种
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It's basically--if I am told that you're a genius and your genius is about to be in full-flower throughout this class and it's a small class as these classes were, I'll focus more on you, I'll give you more of my attention.
它其实…如果有人告诉我你是天才,你的才智能在这节课上完全体现出来,这个班的人不多，我就会把更多的注意力放在你身上。
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In fact, even if you haven't had a biology class it's hard to be alive in 2008 and not know something about DNA; it's become such an important part of our lives.
实际上,即使你们没有上过生物课,也不可能活在当下却对DNA一无所知,它已经与我们的生活密不可分
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It used to be a lot easier to be physically active then it is today, and we'll discuss this later in the class, but energy saving devices all over the place.
在过去,人们比现在从事更多的体力活动,这一点我们以后再讲,帮助你省力的装置,如今随处可见
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Conversely, if I chose a Beta and my pair chooses an Alpha, so I end up with a C and she ends up with an A, then you know I have a bad time explaining to my parents why I got a C in this class, and I have to say about how I'm going to be president anyway.
相反如果我选β我对手选α,我得到C她得到了A,我回家后很难跟父母,解释为什么我只得到了C,然后我还得表示下雄心壮志
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