Pecans are the only major tree nut native to the U. S., which produces about 80 percent of the world's crop.

美国山核桃是起源于美国的主要坚果树种，全世界百分之八十的山核桃产量来自于美国。

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Pecans are the only major tree nut native to the U. S., which produces about 80 percent of the world's crop.

美国山核桃是起源于美国的主要坚果树种，全世界百分之八十的山核桃产量来自于美国。

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