Instead of three adjacent walkways moving at different speeds, the new walkway changed speed along its length.
不同于三条不同速度的邻近人行道的设计，新的人行道系统根据它的长度改变速度。
2
The vehicles ran at maximum speeds of 38 miles per hour (60 kilometers per hour) and had to be recharged for eight hours after every two to three hours of driving.
Each racket is tested using three different racket speeds and six different impact locations on the face of the racket to identify the optimal power point on the racket head.