“附加条款”常见的英文表达是 “additional clauses” 或 “supplementary clauses”。
additional clauses：强调在原有基础上新增的条款内容。例如：The contract includes several additional clauses regarding liability.（这份合同包含几条关于责任方面的附加条款。）
supplementary clauses：侧重于对原有条款进行补充、完善的条款。例如：The parties agreed to add supplementary clauses to clarify certain ambiguous points in the original agreement.（双方同意添加补充条款，以澄清原协议中某些模糊的要点。 ）