Some way into its path - perhaps around the 10 m mark (or at about the position of the wall of defenders) - the ball's velocity dropped such that it entered the laminar flow regime.
在球运行路径的某一点(10米处，或人墙的位置)球的速度下降，使空气在球体表面形成较稳定的层流。
2
Connect the first data flow operator to the second using the green check mark in the upper right corner to make a conditional connection.
使用右上角的绿色对勾把第一个数据流操作符连接到第二个，这会建立有条件连接。
3
If required inputs aren't provided, the flow will indicate that it is not ready to be run by displaying an exclamation mark (!) on the offending activity in the flow editor.