A medical or scientific researcher or doctor looking at a test tube isolated on white background
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- 大图:4208 × 3576 像素·35.63 cm × 30.28 cm·300dpi·JPG
- 中图:1000 × 850 像素·35.28 cm × 29.99 cm·72dpi·JPG
- 小图:500 × 425 像素·17.64 cm × 14.99 cm·72dpi·JPG