The classification of propositions on the basis of whether they assert or deny the possibility, impossibility, contingency, or necessity of their content.
分词翻译
不的英语翻译：
nay; no; non-; nope; not; without 【医】 a-; non-; un-
可能性的英语翻译：
possibility; probability; feasibility; chance; likelihood; potentiality 【经】 probability
