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a. 頑固な, 強情な, 片意地な, いこじな, しつこい; 頑強な; 〈害悪・病気などが〉根深い, 執拗な. いやしがたい. 研究社リーダーズプラス
英単語
Optimized studying based on the forgetting curve vastly improves memorization. - What is reminDO? Memorize
A85rmd
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