Seconds

nano seconds

ns: 1/1,000,000,000 second, i.e. 10(-9) seconds
1 ns = 1/1,000 micro second
1 ns = 1/1,000,000 milis second

used in telecommunications

micro seconds

Its symbol is μs. 微秒
1 μs = 1000 ns
1 μs = 1/1,000 milli Seconds

8.01 μs: light took the time to travel 1 mile in vaccum

The average human eye blink takes 350,000 microseconds (just over 1/3 of one second).
The average human finger snap takes 150,000 microseconds (just over 1/7 of one second).
A camera flash illuminates for 1000 microseconds.

milli second

ms 毫秒
1 ms = 1/1,000 second
1 ms = 1,000 μs = 1,000,000 ns

3 ms: fly flgp its wing
5 ms: bee flap wing
300-400 ms: human eye to blink