It means that the beginning (supply) and end (final sales and consumption) of a product are all abroad.
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In addition, we can think so, because this form of enterprise is generally a wholly foreign-owned enterprise, and people use advanced technology, but there is no labor force. We only introduced it to increase some employment opportunities and get tax revenue. Of course, it is not that we are all poor in ability, but that we are poor in this respect.
In fact, this question should be asked in the regular study or the enterprise knowledge, which belongs to that category.