souvenir 用英语:

He's a good reminder of what I don't want to become

If a buyer does not pay a price, he is often served with a reminder.

I need to set a reminder on my mobile

a reminder of the dangers of drinking and driving

Should you have settled the account since this mail was written, please ignore our reminder.

This is a friendly reminder about an overdue invoice.

Friendly Reminder: Please keep in mind the closing time of the line you need to switch to, so as to avoid delays in your trip.