actual flow velocity的用法和样例：
- The error between the actual flow velocity value and the flow velocity value of fluorescent globules in the chamber measured under the same system was below 7%. The upper limit was 9.6 mm/s. There are no obvious differences (P>0.05).
- Flow velocity should not exceed 5 ft./sec.
- High flow velocity was found in some patients accompany stenosis of the siphon.
- The metal flow velocity can become uniformity by optimizing the die structure.
- Strait to the South Central there is a flow velocity of 10 cm / sec around.