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例句 DEFINITIVE EXAMPLES 权威例句〔ectoderm〕The outermost of the three primary germ layers of an embryo, from which the epidermis, nervous tissue, and, in vertebrates, sense organs develop.外胚层:胚胎最初三层胚层中的最外一层,由此发育成为表皮、神经组织和脊椎动物的感觉器官美国传统〔set piece〕The first three Celtic goals came from set pieces.凯尔特人队最初三个进球全是按套路踢进的。外研社新世纪
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