发动机压力比(epr)，进气压力与排气压力值的比，某些发动机以此作为设定推力的主要依据。
Engine pressure ratio (EPR), the ratio of inlet pressure over exhaust-let pressure measurements. The ratio is used as the primary parameter to set thrust on some engines.
反推装置（T／R）系统控制风扇叶片气流 的排气方向从而实现正推力和反推力。
The thrust reverser (T/R) system controls the direction of the fan air exhaust to make forward or reverse thrust.
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