To realize the value of one year

Ask a student who has fail a final exam

To realize the value of one month

Ask a mother who has given the birth to a premature baby

To realize the value of one week

Ask an editor of a weekly newspaper

To realize the value of one hour

Ask the lovers who are waiting to meet

To realize the value of one minute

Ask a person who has missed the train, bus or plane

To realize the value of one second

Ask a person who has survived an accident

To realize the value of one millisecond

Ask the person who has won a silver medal in the Olympics

（来源：校内网论坛）