书稿对外贸业务中的单据做了详尽而全面的介绍和分析，并且采用全英文表述，具有很强的实用性和指导性。新版教材根据国际国内贸易形势的新变化和相关惯例政策的变化做了相应调整，重点更新了INCOTERMS 2020,ISBP821等相关内容。本书可作为国际贸易、国际商务及相关专业的教学用书，同时也非常适合相关从业人员参看之用。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