The idea is that this incentive will prove more effective than top-down plans in stimulating more house-building.

在刺激房屋建造方面，此想法认为以上的激励措施比实施自上而下的计划更加行之有效。

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By going back and outlawing any events that would later prove paradoxical in the future, this theory gets rid of the uncomfortable idea that a time traveler could prevent his own existence.

回到过去并禁止发生任何日后可能证明悖谬的事件，这一理论摆脱了那个令人不安的概念：时间旅行者可能阻止自己的存在。

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Is: It's almost a contradiction... this idea of photography and the fleeting moment. Isn't the idea of taking a photograph to prove that you are there?

萨：这几乎是一个对立面，这就是摄影的观念和短暂的瞬间。是否可以这样说，拍摄照片就是为了证明你的存在？

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