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.
白色木质且光滑的一种五针松，幼树树皮呈浅灰色；特别指东部白松。
Any of several5-needled pines with white wood and smooth usually light gray bark when young; especially the eastern white pine.
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