Low power scanning electron microscope image of tooth surface, computer-coloured yellow on blue background.
牙齿表面的电子显微镜扫描图。
Start by drawing in a coloured background.
首先绘制一个深色的背景。
Must be clear and well defined, taken against a plain white or light coloured background.
照片必须清晰并轮廓分明，背景为纯白色或浅色。
Must be clear and well defined, taken against a plain white or light coloured background.
照片必须清晰并轮廓分明，背景为纯白色或浅色。
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