illustration of colour from mashed petals dyeing blotting paper pale yellow and purple - 多微孔的 幅插畫檔、美工圖案、卡通及圖標
1890s victorian fashion, ladies underarm liners for perspiration - 19th century - 多微孔的 幅插畫檔、美工圖案、卡通及圖標
19th century bunsen element electrochemical cell diagram with zinc and carbon electrodes in acidic solution - 多微孔的 幅插畫檔、美工圖案、卡通及圖標
black coloured rough textured asphalt road like grunge vector abstract grainy frothy horizontal background that is blank and empty and has froth or foam pattern design all over - 多微孔的 幅插畫檔、美工圖案、卡通及圖標黑色
hand holding tampon and sanitary pad. feminine hygiene and menstrual product choice concept - 多微孔的 幅插畫檔、美工圖案、卡通及圖標
conceptual image of radiolarians with a skeletal frame. radiolarians are tiny protozoans that live in the ocean. - 多微孔的 幅插畫檔、美工圖案、卡通及圖標
microscopic view of dentine. dentine is the main supporting structure of the tooth and is the second hardest tissue in the body after enamel. it is 70% mineral and acellular. - 多微孔的 幅插畫檔、美工圖案、卡通及圖標
amadou is a spongy material derived from fomes fomentarius and similar fungi that grow on the bark of coniferous and angiosperm trees , also known as the "tinder fungus" and is useful for starting slow-burning fires - 多微孔的 幅插畫檔、美工圖案、卡通及圖標雕刻圖像, 菇類