单位都是，弧度每秒，和角速度一样。
The units are in radians per second, the same as angular velocity.
每秒走过多少米就是线速度，和每秒经过多少弧度是相反的，那是角速度。
How many meters per second is linear, as opposed to how many radians per second, which is angular velocity.
角速度不是指每秒经过的路程，而是指每秒经过的弧度。
Angular velocity means not how many meters per second but how many radians per second.
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