必然性

1. 模态逻辑命题的限制条件，建立在其内容的肯定或否定其可能性，不可能性，偶然性或必然性基础之上
   The classification of propositions on the basis of whether they assert or deny the possibility, impossibility, contingency, or necessity of their content.
2. 必然发生或结局的确定性；必然性
   Sureness of occurrence or result; inevitability.

必的英语翻译：

然的英语翻译：