垃圾翻译，建议对照英文版看，否则会被带偏

垃圾翻译。

P370 马尔克夫链的遍历性

the long-term proportion of time spent by the chain ..

The proportion of time spent in state i after k returns, denoted by..

The return times T_i form a sequence of statistically independent and identically distributed random variables.

这三个time大家感受一下，第一个翻成了时间长度，第二个翻译成了时间，第三个翻译成了返回时间...