microscopic views of various cystine crystalluria (crystals) in human urine - 19th century - 大倍數放大 幅插畫檔、美工圖案、卡通及圖標
laboratory and microscope equipment. histology, analysis, research. - 大倍數放大 幅插畫檔、美工圖案、卡通及圖標圖示, 體檢, 腫瘤