Darkness is in reality the absence of light. Light we can study, but not darkness.
黑暗其实是因为缺少光的缘故，我们可以研究光线，但无法研究黑暗。
In light of the reality, this is not a simple issue of inputs and outputs.
从现实情况来看，这并不是一个简单的投入和产出问题。
In light of the reality, this is not a simple issue of inputs and outputs.
从现实情况来看，这并不是一个简单的投入和产出问题。
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