() an extra piece of information (clause) that is added to a contract or an official document 附文；公文的附加材料；附加条款
() extra information that is added to an insurance agreement in order to include extra items that are not mentioned in the standard agreement; a form used to add this information 保险附加条款；附加险（表格）◆You can add a rider to a home insurance policy to cover computer equipment. 你可以在房屋险保单里增加投保计算机设备的附加险。