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单词 mesoderm 释义 mesoderm|msdm|[f. Gr. - middle + skin.]1. Bot. a. ‘The middle layer of tissue in the shell of the spore-case of an urn-moss’ (Treas. Bot. 1866). b. ‘The middle layer of the bark’ (Syd. Soc. Lex. 1890).1874Q. Jrnl. Microsc. Sci. XI...