postscript
/ˈpəʊstskrɪpt/noun
1- an additional remark at the end of a letter, after the signature and introduced by 'PS'附笔, 又及：
he added a postscript: 'Leaving tomorrow'.
他加了一个附言“明日出发”。
1.1
- an additional statement or action which provides further information on or a sequel to something补充说明; 后续行动; 续篇：
as a postscript to this, Paul did finally marry.
补充说明一下, 保罗最后终于结婚了。
词源
mid 16th cent.: from Latin postscriptum, neuter past participle (used as a noun) of postscribere 'write under, add', from post 'after, later'+scribere 'write'.