那封旧信是他们友谊的一个提醒。
The old letter served as a ___reminder of their friendship.
“时间宝贵”是对我们职责的持续提醒。
"Time is precious" is a constant ___reminder of our duties.
咖啡的味道是一个愉快的提醒，让我想起我的早晨惯例。
The smell of coffee is a pleasant ___reminder of my morning routine.
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