烟草等级分类有很多标准，烟叶叶片结构是其中的标准之一。

There are many standards in tobacco grade classifying, and tobacco leaf structure is a important standard.

youdao

烟草等级分类有很多标准，烟叶叶片结构是其中的标准之一。

There are many standards in tobacco grade classifying, and tobacco leaf structure is a important standard.

youdao