“人总是要死的”，是一个肯定命题。
汉语表达肯定命题的否定句式的实质是连用两次否定形式并表达一个肯定意义。
The essence of negative sentence pattern to express affirmative proposition is to link two negative forms together for a positive sense.
主词，主项，主概念：逻辑命题中的一个词，它表示肯定或否定的论题。
Logic The term of a proposition about which something is affirmed or denied.
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