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必ずしも, かならずしも
1. (not) always, (not) necessarily, (not) entirely, (not) all
(并非)总是如此,(并非)必然如此,(并非)完全如此,(并非)全部如此
は
1. indicates sentence topic
2. indicates contrast with another option (stated or unstated)
3. adds emphasis
指示句子的主题;表示与另一选项(无论是否明确提及)形成对比;表示强调