外贸英语合同这句如何翻译?多谢

问题描述:

外贸英语合同这句如何翻译?多谢
Irrevocable Letter of Credit issued by buyer or buyer’s nominated party in favor of seller or seller’s nominated beneficiary, shall be opened within 7 working days after receiving performance bond,provided seller establish performance bond in favor of buyer to cover 2% of total contracted value within 7days after contract date.

外贸英语合同foreign trade contract