This is a baby elephant, so it's really, really big-- except it's a baby elephant, so it's really, really small."
这是只大象宝宝,所以它很大很大,但是它只是个大象宝宝,所以它其实又很小很小
But there's also elephant polo as well,
这里也有大象马球,
Then the seesaw will balance, even if you put a potato on one side and an elephant on the other side.
那即使你一边放个土豆,一边放头大象,那跷跷板也会平衡
So, you take a sentence like -This is a classic line from Groucho Marx: "I once shot an elephant in my pajamas.
举例来说,这是《格劳乔·马克斯》的经典台词,"我曾在我的睡衣里射杀了一头大象
He said when an elephant has fleas it is the fleas that do the jumping.
他说当一头大象身上有了跳蚤,是跳蚤而非大象在跳。
Whatever you do when you're riding an elephant, whatever you wear.
不管你是骑着大象也好还是穿着别的也罢
So they now ride around on elephants,
运动员骑着大象,
Do not think of a pink elephant for the next three seconds ? and I am sure no one thought of a pink elephant right?
在接下来的十秒钟里不要想粉色大象,我肯定没有人想一头粉色大象,是吗?
For example, how do I know that when I pull the spring the first time for the mass, it exerted the same force when I pulled the spring the second time for the elephant?
例如 怎样才能知道,第一次连着物体拉弹簧时,产生的力和,第二次连着大象拉弹簧时产生的力是相等的呢
Suppose you are being pulled by my favorite animals -- the elephants -- from both sides by equal force.
假设我最喜欢的动物,大象从两边拉你
With some degree of confidence, I'm working with a reliable spring and then I will get the mass of the elephant.
这时我就对弹簧有信心了,我用的是一个可靠的弹簧,我能测出大象的质量
But the acceleration it produces on the elephant and on the mass, are in an inverse ratio of their masses.
但这个力使大象和物体产生的加速度,与它们的质量成反比
Remember, when we hang the elephant in outer space, nothing is going to happen.
记住,如果我们在外太空悬挂一头大象,弹簧是不会有变化的
Then, I bring the elephant and I pull the spring by the same amount and I find the acceleration of the elephant and the denominator is obviously the mass of the elephant.
然后我再找来大象,用相同的力去拉弹簧,大象就具有了加速度,很明显,分母就是大象的质量
I'm telling you, "What's the mass of the elephant?"
我要问你,"大象的质量是多少"
When you say, "Push the elephant," you want to push it in a particular way?
你刚才说,"推那头大象",你想用什么特别的方法来推吗
Then I give you another object, an elephant.
然后我给你另一个物体,一头大象
If you knew this was one kilogram, then the acceleration of the elephant, which will be some tiny number, maybe 100th of what this guy did; the mass of the elephant is then 100 kilograms.
如果已知这个物体的质量为 1 千克,那大象的加速度,会是一个比较小的数,可能是物体加速度的 1 / 100,大象的质量就是 100 千克
We did the comparison with the elephant or something; a is the second derivative of x and for this problem, when F is due to a spring, we know the force is that by studying the spring.
我们也已经把它与大象或其它东西作过比较,a 是 x 的二阶导数,在这个问题中,F 是由弹簧产生的,我们在讨论弹簧问题时已经知道了力的大小
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