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仮説， かせつ
1. hypothesis, supposition, assumption, tentative theory
假说，假定，暂定理论
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裏付け， 裏づけ， 裏付， うらづけ
1. support (e.g. for an argument), backing, proof, evidence, corroboration, substantiation, guarantee, security
tbd
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
