In the first case we call the proposition a tautology; in the second, a contradiction.
在第一种情况下，我们称这命题为重言式，在第二种情况下，称这命题为矛盾式。
Life's a tough proposition, and the first hundred years are the hardest.
生命是道难题，尤数头一百年最是辛苦。
Life's a tough proposition, and the first hundred years are the hardest.
生命是道难题，尤数头一百年最是辛苦。
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