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世界是一切实际情况的总和。
The world is everything that is the case.
The battle of life is already half won by the young man who is brought personally in contact with high officials; and the great aim of every boy should be to do something beyond the sphere of his duties--something which attracts the attention of those who over him.
The key to credible causal inference is not just the method, but how well the method fits the question at hand.