人类活动已经对生态系统造成严重破坏。
Human activities have given rise to severe damage to the ecosystem.
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Our usual terms of payment are by confirmed , irrevocable letter of credit in our favour, reaching us one month ahead of shipment.
Ifyouincreaseyourinitialorderto30,000,Isupposewecouldconsiderreducingthepriceto300,080$perunit.
Wehavenowdecidedtosupplyyouwithallthepartsasitemizedinyourorderandgoingtoapplytothegovernmentagenciesconcernforexportlicenses.