偶然性的用法和樣例：
例句
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模態(tài)邏輯命題的限制條件，建立在其內容的肯定或否定其可能性，不可能性，偶然性或必然性基礎之上
The classification of propositions on the basis of whether they assert or deny the possibility, impossibility, contingency, or necessity of their content. -
偶然性取決于機會(huì )的情形；不確定性
The condition of being dependent on chance; uncertainty.
