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单词 凸凹
释义 〔conchoidal〕Of, relating to, or being a surface characterized by smooth, shell-like convexities and concavities, as on fractured obsidian.贝壳状的:(属于)表面光滑且呈贝壳状凸凹特点的、或与之有关的,如黑曜石碎块〔strain〕a superior strain of wheat; a smooth strain of bacteria.麦子的高级品系;细菌的无凸凹种类
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