Gear oils should be changed more frequently when operating vehicles or equipment in dusty or dirty conditions unless the gear system is properly sealed and equipped with membrane type breathers.
齿轮油应改为更频繁地操作车辆或灰尘或龌龊的条件，设备，除非齿轮系统妥善密封，膜型呼吸器装备。
The compressor speed was regulated to keep the suction pressure constant when the operating conditions were changed.
当系统的运行工况发生变化时，利用压缩机转速的调节以保持吸气压力的一定。
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