Variable bit rate (VBR) and constant bit rate (CBR).
可变比特率（VBR）和恒定比特率（CBR）。
Thrust value is constant and thrust direction variable.
假定发动机推力大小为常值，方向可调。
The thrust value is constant and the thrust direction is variable.
发动机推力大小为常值，方向可调。
The thrust value is constant and the thrust direction is variable.
发动机推力大小为常值，方向可调。
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