结果：怀山药、淮南山药、铁杆山药三个品种有一定差异，但它们的主要成分相同。
Results: Although there were some differences among the three varieties, the same major constituents were founded in them.
结果：怀山药、淮南山药、铁杆山药三个品种有一定差异，但它们的主要成分相同。
Results: Although there were some differences among the three varieties, the same major constituents were founded in them.
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