To establish certainty, then, we must first of all ignore, or ‘put in brackets’, anything which is beyond our immediate experience; we must reduce the external world to the contents of our consciousness alone.
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There is no better way to do this than through a global climate agreement, which would establish the predictability and certainty that investors require.
最好的办法就是，依靠能确立投资者所需的可预测性和确定性的全球气候协议。
Since the mean requirement for many nutrients is not known with certainty, it is often difficult to establish an RDA.
由于很多营养素的平均需要量不能很好的确定，所以很难评价rda。
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