20 meters per second is too fast.
每秒20米的速度太快。
8-6 + 2 meters per second. You see?
是8 - 6，也就是+2米每秒，明白？
And that is about 133 meters per second.
大概是133米每秒。
And this velocity is in meters per second.
这里速度是米每秒。
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 average flow of the river is 200 cubic meters per second.
这条河平均流量为每秒200立方米。
The average flow of the river is 200 cubic meters per second.
这条河平均流量为每秒200立方米。
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