然后使用目录，真正科学地了解每种产品的知识后，将产品销售给他们的朋友，邻居和亲戚。

Then, using the catalog, along with knowledge of the real science behind every product, they can market the line to their friends, neighbors, and relatives.

youdao

然后使用目录，真正科学地了解每种产品的知识后，将产品销售给他们的朋友，邻居和亲戚。

Then, using the catalog, along with knowledge of the real science behind every product, they can market the line to their friends, neighbors, and relatives.

youdao