解释这段英语的意思.这段话的意思（不要单纯翻译）.Please,sendyourworkusingonlyregularmail.AccordingtotheUkrainianlaw,nopackagetoaprivatecitizenissubjecttothepostalanddeliverycharges,aslogasitsestimated

　　解释这段英语的意思.

　　这段话的意思（不要单纯翻译）.

　　Please,sendyourworkusingonlyregularmail.AccordingtotheUkrainianlaw,nopackagetoaprivatecitizenissubjecttothepostalanddeliverycharges,aslogasitsestimatedvalueisunder$20.Please,donotsendthepackagesviaexpressmail(DHL,AmericanExpressetc),sincepackagescontainingdocumentsonly(postersareNOTconsidereddocuments)areexemptedfromtheotherwiserequiredcustomscharges,ifthepackageissendusingthesepostalservices.Executivecommitteewillnotbeabletoaffordthosecharges,collectedupondelivery,iftheexpressmailservicesareused.