However, increasing the velocity at a given spin reduced the lift coefficient.
但是，旋转速度不变的情况下增加球速会降低升力系数。
2
It appears, however, that the "drag coefficient", CD, also depends on the velocity of the ball.
然而，阻力系数CD，也取决于球的速度。
3
The mass transfer equation was introduced into heat transfer model of falling film evaporation. The radial velocity, mass diffusion coefficient and variation of film thickness were taken into account.