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Listen to part of a lecture in an astronomy class.
请听一段天文课上的演讲。
You will not need to remember the numbers the professor mentions.
教授提到的数字无需记忆。
OK.Let’s get going. Today I’m going to talk about how the asteroid belt was discovered.
好了。我们开始。今天我要讲小行星带是如何被发现的。
And...I’m going to start by writing some numbers on the board.
我们将从黑板上的这些数字开始。
Here they are: We’ll start with zero, then 3,...6,...12. Uh, tell me what I’m doing.
开始写了：我们从0 开始，接着是3，6，12......说说我在做什么？
Multiplying by 2?
（所得值）乘以2？
Right. I’m doubling the numbers, so 2 times 12 is 24, and the next one I’m going to write after 24 would be...
不错。我在使这些数翻倍，所以2 乘以12 是24，24 之后我要写的数是......48.
48. 48.Then 96. We’ll stop there for now. Uh, now I’ll write another row of numbers under that.
48。48。然后是96。我们暂时停一下。嗯，我在这一组数字下面写另外一组数字。
Tell me what I’m doing. 4,7,10...How am I getting this second row?
说说我在干什么？4,7,10……第二组数字我是怎么得到的？
Adding 4 to the numbers in the first row.
在第一组数字后面加上4。
I’m adding 4 to each number in the first row to give you a second row.
现在我给第一组数字的每一个数字加4得出第二组。
So the last two will be 52,100, and now tell me what I’m doing.
所以最后两个数字就是52，100，说说我在做什么？
Putting in a decimal?
十进位排序？
Yes, I divided all those numbers by 10 by putting in a decimal point.
是的，我用这些数除以10。
Now I’m going to write the names of the planets under the numbers.
我现在在这些数字下面写上行星的名字。
Mercury...Venus...Earth...Mars. So, what do the numbers mean? Do you remember from the reading?
水星......金星......地球......火星。那么，这些数字是什么意思？你们还记得阅读中的内容吗？
Is it the distance of the planets from the Sun?
是从这些行星到太阳的距离吗？
Right. In astronomical units—not perfect, but tantalizingly close.
是的。用天文单位计算——不算精确，但极为接近了。
The value for Mars is off by...6 or 7 percent or so.
火星到太阳的距离来说可能偏差6%到7%。
It’s...but it’s within 10 percent of the average distance to Mars from the Sun.
但……从火星到太远的平均距离误差应该在10%以内。
But I kind of have to skip the one after Mars for now.
我暂时先跳过火星后的这颗行星。
