他在会议纪要旁边写了个简短的备注。

He added a brief ___rem next to the meeting notes.

这张照片是我们旅行的纪念。

This photo is a ___reminder of our trip.

科学家发现大多数梦境发生在快速眼动睡眠阶段。

Scientists found that most dreams happen during ___rem sleep.