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A good producted in a country and sell it directly to other country. Export
A good producted in one country, and export to another country, the second country use the good to product or match it up to some domestic good , and then export to a third country, this is an Export good by the second country.
A good producted in one country, export to other country, the second country export it to a third country without any other work process, this good are count as Re-export.
Just like in the 80's, a lot of garment products were export from China to Hong Kong. A lot of them then reexport to USA, USA count them as China products and Hong Kong just acts as a Re-export port. On the other hand, those garments which add some pinned flowers in the front or back, those were counted as Export by Hong Kong.