它是个机械部件

For the proper operation of the machine, 300 to 500 litres of air should be drawn in per minute.
Check the pressure-gauge on the FRL air input unit (Filter Pressure Reducer Lubricator), which should remain within a range of 6 to 8 bar.
为保证机器的正常运转,每分钟需要输入300到500升的空气.
查看FRL(滤波减压器润滑剂)空气输入设备上的压力计,应该维持在6~8个大气压之内.

FRL
Frame Representation Language,帧表示语言
FRL
Flight Reference Line 飞行基准线
FRL
Fuselage Reference Line 机身基准线