求翻译：合同谈判，工厂谈判，内外销的合同制定 进口换单，出口打单，订舱，出口收汇，结汇，核销退税，利润计算是什么意思？

Contract negotiations, factory negotiations, the contract for export of import for a single, exports hit single, booking, export proceeds, foreign exchange, write off tax rebate, profit calculation

Contract negotiations, negotiations, and factories in the export-import development contracts, export and click Export, booking, receipt, Exchange, refund, cancellation profit

The contract negotiations, the factory negotiations, in the for sale abroad contract formulation import trades the list, the exportation blackmails, subscribes the cabin, the exportation receives collects, the settlement of exchange, cancels after verification the tax reimbursement, the profit compu

Contract negotiations, factory negotiation, export contracts to develop import-for single, export, booking, export proceeds, settlement, write-off tax rebate, the profit calculation

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