amendment advice造句怎么写

Pls extend the shipment date and the validity of your L/C No.111 to the end of Jan. and Feb.15,2006 respectively, and see to it that the amendment advice will reach us before the end of Dec.2005.

The amendment advice should reach us before November 15, 2001, failing which you must extend the validity of the L/C to the end of this year.