求翻译：信用证在装船后21天中国到期是什么意思？

Letter of credit after shipment due 21 days

Loading the boat in letters 21 days after the due date

The letter of credit is loading a ship latter 21 day China to expire

Shipment of letter of credit expires 21 days after China

When the credit is, you would have the effect of location opened in China in the period expired, period for presentation at least 15 days after the date cannot be less than the Bill of lading issued, 18 days is better, of course. In order to avoid unnecessary modifications, the credit is initial, fi