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theretofore adv.那時以前,直到那時。

thereunder

The efficient use by buyer of any item called for under purchase order requires that data , if any , be delivered not later than the time specified in purchase order , if such data is not so delivered , buyer may , at its election , so long as such date remains undelivered , withhold payment to seller for any item theretofore or thereafter delivered 為了買方的有效使用,采購訂單中會要求相關資料,如果有的話,要在采購訂單規定的日期前交付,如果這樣的相關資料沒有交付,買方可以選擇暫停對已交貨的和將要交貨的貨物付款,只要相關資料沒有交付。