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释义 〔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〔eghs〕Suffixed (superlative) form.extreme , from Latin extrēmus , outermost ( *-mo- , superlative suffix). 后缀的(最高级)形式.extreme , 源自 拉丁语 extrēmus , 最外的 ( *-mo- , 最高级的后缀). 〔surface〕The outer or the topmost boundary of an object.表面:物体的最外或最上边界〔periphery〕The outermost part or region within a precise boundary.边缘地带:在一个精确边界内部的最外部分或地区〔epidermis〕The outermost layer of cells covering the leaves and young parts of a plant.外胚层:覆盖于植物叶面和萌芽之上的最外一层细胞〔geocorona〕The outermost region of the earth's atmosphere, consisting chiefly of ionized hydrogen.地冕:地球大气的最外部分,主要由电离的氢组成〔extreme〕Most remote in any direction; outermost or farthest:最远的,极端的:在任何方向上都是最远的;最外的或最远的:〔extremity〕The outermost or farthest point or portion.末端,极点:最外或最远的点或部分〔thermosphere〕The outermost shell of the atmosphere, between the mesosphere and outer space, where temperatures increase steadily with altitude.热大气层,热电离层:大气层介于中间层和外层空间之间的最外一层,在这一层中温度随高度而稳定增加
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