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���匦���Q�I���еĆΓ�����Ԕ�M��ȫ��Ľ�B�ͷ��������Ҳ���ȫӢ�ı��������к܏��Č����Ժ�ָ���ԡ��°�̲ĸ������H�����Q���΄ݵ���׃�������P�T�����ߵ�׃�����������{�������c������INCOTERMS 2020,ISBP821�����P���ݡ�������������H�Q�ס����H�̄ռ����P���I�Ľ̌W�Õ���ͬ�rҲ�dz��m�����P�ĘI�ˆT����֮�á�According to the formality of contract conclusion and evidence�� S��C may be classified into verbal contract and non-verbal contract.    Any contract that uses words�� spoken or written�� is a verbal contract.Thus�� all oral con- tracts and written contracts are verbal contracts.This is in contrast to a " non-verbal contract" �� also known as "a contract implied by the acts of the parties"�� which can be either implied in fact or implied in law.    According to the UNCISG article 11�� a contract of sale need not necessarily be concluded in or evidenced by writing and is not subject to any other requirement as to form.It may be proved by any means�� including witnesses.