duplicate copy的用法和樣例：
例句
- I will send you a copy of the letter.
我將把信件的副本寄給你。 - The following is a cached copy of the requested page, and may not be up to date.
本頁已經被保護，但你仍能複製本頁的原始碼。 - This copy of the world famous painting is glued onto the wall with the all-purpose glue.
這幅世界名畫複製本是用萬能膠粘在牆上的。
