Sunlight, Upper epidermis, Palisade mesophyll, Spongy mesophyll, Diffusion of oxygen (arrow), Diffusion of carbon dioxide (arrow), Xylem, Phloem, Guard cells, Air space, Stomata, Waxy cuticle, Lower epidermis.

排行榜

視覺風格

選項

切換範本

恢復自動保存: ?