But before they can trace their bikes or jump their ropes or toss their Frisbees, children understand they must first convince their friends to play along with them.
但是在他们比赛骑自行车，或跳绳，或仍飞盘之前，他们都知道要先说服小伙伴和他们一起玩。
The actual rotary speed during the stage jump input period could trace the given rotary speed and there was no error during the stabilized period.
实现了阶跃输入时的实际转速对给定转速的跟踪，而且稳态时无偏差。
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