Mayflies are delicate-looking insects with one or two pairs of membranous triangular wings which are extensively covered with veins. At rest the wings are held upright.
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- 大图:4928 × 3264 像素·41.72 cm × 27.64 cm·300dpi·JPG
- 中图:1000 × 662 像素·35.28 cm × 23.35 cm·72dpi·JPG
- 小图:500 × 331 像素·17.64 cm × 11.68 cm·72dpi·JPG