None 儿童 人民 白种人种族 A boy colors among papers on the floor as his dad works at his desk in the background
A Marabou Stork (left) and Secretarybird (right), circa 1850. (Photo by Hulton Archive/Getty Images) 草 marabou 鹳 1850-1859 Marabou And Secretarybird
A diagram of the human skeleton, circa 1900. (Photo by Hulton Archive/Getty Images) 白色背景 解剖 人类的表示形式 Human Skeleton
part outline human cartoon out body mouth tongue sticking tongues tounge Mouth With Tongue clip art 嘴里 舌 人民 口与舌剪贴画
Lessons in Zoology by Clarabel Gilman, Common Animal Forms, New England Pub. Co prior to 1911 蜗牛 外壳 动物 蜗牛壳
None Globe - Navigational Equipment 技术 黄色 Hand holding globe against colored background (Digital Composite)
None 工作 人民 Globe - Navigational Equipment Roman clock and line graph with businessman (Digitally Generated)