词汇	seal circle
释义	seal circle 坐回环
随便看	pre-flight instructions preflight investigation preflight maintenance preparation preflight meal preflight medical analysis preflight medical examination pre-flight message-generating officer Pre-Flight Operations Division Preflight Operations Procedure Pre-Flight Rating Test Pre-Flight Reliability Test preflights pre-flights Preflight Test Bus preflight training prefloat prefloat circuit Pre-floating prefloat treatment prefloc prefloc chamber preflocculation pre-flock pre-flock chamber preflood