• 索引suǒ yǐn index; reference; indexing; X
• 未知因素wèi zhī yīn sù X factor
• 限制级电影xiàn zhì jí diàn yǐng X-film

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krausite, Kraut, kreatin, kreatinase, kreatine, kreatinin, kreatininase, kreatinuria, Krebs, Krebs cycle,

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3G, 401(K), a,