If Back to the Future 2 holds your standards for technology there are a lot of things we should have by now — one of them being flying cars.
如果“回到未来2”让你对科技有了新的标准，那么我们现在应该有很多东西——其中之一就是，飞行汽车。
Who will probably succeed in the future according to Paragraph 2?
根据第二段内容，未来谁可能会成功？
In fact, they operate in an unknowable [2] future and traditional tools to capture their dynamics do not apply.
事实上，它们发生在不可知的[2]未来，传统用来捕获它们动态特点的工具不起作用。
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