这针对的只是三个变量。
《经济学人》根据对这三个变量的合理预期做出仔细计算，发现中国可能在下个十年中超过美国。
The Economist has crunched the Numbers and found that, based on reasonable assumptions about these three variables, China could overtake America in the next decade.
但我们不去做超过三个变量的，所以你不需要知道，这个需要你知道，把它框起来。
But we are not going to go beyond three variables so you don't need to know that. This you need to know so let me box it.
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