The velocity of the Earth in orbit is about 30 kilometers per second.
地球在轨道里的速度，约为30千米每秒。
Electromagnetic waves travel with the speed of light, which is 300,000 kilometers per second.
电磁波，以光速传播，也就是30万公里，每秒。
Electromagnetic waves travel with the speed of light, which is 300,000 kilometers per second.
电磁波，以光速传播，也就是30万公里，每秒。
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