antique illustration, physics principles and experiments, electricity and magnetism: suspended magnetic rod - 桿狀 幅插畫檔、美工圖案、卡通及圖標
rod as a symbol of god's word, an ancient glass calices or paterae, christian symbolism art - 桿狀 幅插畫檔、美工圖案、卡通及圖標
biomedical illustration of tuberculosis, an infectious disease caused by bacteria. - 桿狀 幅插畫檔、美工圖案、卡通及圖標
black radial shapes form a circular burst around a blank white center on a white background, creating a stark monochrome pattern with strong contrast and balanced symmetry. - 桿狀 幅插畫檔、美工圖案、卡通及圖標