每隔几年，你就会在某个选举中谨慎地改变一些变量，然后观察结果。
Democratic elections are scientific experiments: every couple of years you carefully alter the variables with an election and observe the results. If you want different results, change the variables.
“不时地，偶尔，每隔一些时候” 他并不是经常去体育馆锻炼身体，只是偶尔。 他时不时地买鲜花送给母亲。
He doesn't go to the gym to take exercises, only every now and then . Every now and then, he buys flowers for his …
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