1 number of people

1 to count backwards (from 10 down to 0)

2 to count down

3 from the bottom (lines on a page)

4 from the back (rows of seats)

1 (exam) grade

2 mark

3 score

4 fraction

1 sushi

1 life span

2 life expectancy

3 lifetime (of a machine)

1 one scare after another (idiom)

2 in a constant state of tension

1 lit. their number cannot be counted (idiom); fig. countless

2 innumerable

1 long-lived people, rich harvests (idiom); stable and affluent society

2 prosperity

1 Destiny is inexorable, there is no fleeing it (idiom). Your doom is at hand.

1 Live as long as the Zhongnan Mountains! (idiom)

2 Long may you live!