Light travels faster than sound at the speed of 300,000 kilometres per second.
光速比声速要快，为每秒钟30万公里。
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。
Speed(S):the distance the crest moves forward per second.
速度（S）：每秒钟波峰移动的距离。
Her orbital speed must be a few hundred meters per second.
其轨道速度一定是在每秒几百米。
The standard speed for the paper of the electrocardiograph is 50mm per second.
心电图记录纸的标准速度为每秒50毫米。
If an asteroid hit Earth, it's average speed would be 30kilometers per second.
假如小行星撞击地球，它们的平均撞击速度将达到30公里每秒。
Light travels at a speed of 300,000 km per second.
光以每秒30万公里的速度传播。
The measure of data transmission speed; a thousand bits per second.
用于表示数据传输速率的一种单位。
The measure of data transmission speed; a thousand bits per second.
用于表示数据传输速率的一种单位。
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