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Probability is expectation founded upon partial knowledge. A perfect acquaintance with all the circumstances affecting the occurrence of an event would change expectation into certainty, and leave nether room nor demand for a theory of probabilities.
概率是建立在部分知识基础上的期望。完全了解所有影响事件发生的情况，就会把期望变成确定性，从而为概率理论留下空间和需求。
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