Correct

流速

/ liúsù / 
Strokes

Definition

flow speed/rate of flow

Example

As a Noun

flow rate; current speed/velocity

1
Jūnyún
均匀
de
的
liúsù
流速

even flow

2
Héshuǐ
河水
liúsù
流速

current velocity of a river

3
Tiáojié
调节
liúsù
流速

regulate a flow

As a Noun

velocity of flow