The political and economic life of the cities was centered on their temples, but it now seems probable that the cities had secular rulers from earliest times.
这些城市的政治和经济生活以寺庙为中心,但现在看来,这些城市很可能在早期就有世俗统治者。
Well, the mean is always .2 no matter how many policies you write, so it's going to be--we're going to have a normal distribution centered on .2.
不论你签了多少份保单,均值永远是0.2,所以这就是一个关于x=0.2对称的,正态分布
That's a bell-shaped curve, but it's centered exactly on .2.
这是条钟形曲线,它关于x=0.2对称
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