光滑树皮的北美山胡桃树，有七到九个小叶，有带硬壳的可食用的坚果。
Smooth-barked north american hickory with7to9leaflets bearing a hard-shelled edible nut.
美国中东部森林中的树皮光滑的小红枫是雄鹿进行摩擦的理想树种。
The smooth bark of small red maples makes this species ideal for buck rubs in the forests of the mid-eastern United States.
我感到树叶的对称美，用手摸着白桦树光滑的树皮或是松树那粗糙的厚厚的树皮。
I feel the delicate symmetry of a leaf. I pass my hands lovingly about the smooth skin of a silver birch, or the rough shaggy bark of a pine.
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