Growth rings of a spruce tree horizontal cross section cut through the dried trunk of an European spruce tree Picea abies showing annual or tree rings. A new layer of wood is added every year.
ID: 2413076793
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- 大图:6048 × 3766 像素·51.21 cm × 31.89 cm·300dpi·JPG
- 中图:1000 × 622 像素·35.28 cm × 21.94 cm·72dpi·JPG
- 小图:500 × 311 像素·17.64 cm × 10.97 cm·72dpi·JPG