Slippery Elm (Ulmus rubra) bark was used both internally and externally by native Americans and early pioneer settlers.

榆(榆树杨梅)用树皮内部和外部的土生土长的美国人和早期定居者的先驱。

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Slippery Elm (Ulmus rubra) bark was used both internally and externally by native Americans and early pioneer settlers.

榆(榆树杨梅)用树皮内部和外部的土生土长的美国人和早期定居者的先驱。

youdao