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1·A revocable letter of credit is inadvisable as it carries many risks for the exporter.

一个可撤销信用证不得体，许多危险的出口商。

2·A letter of credit may either be irrevocable and thus, unable to be changed unless both parties agree; or revocable where either party may unilaterally make changes.

信用证是不可撤销的，因此可以，无法改变，除非双方同意，或可撤销的一方可以单方更改。