示例#1
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 public TakingOff(Airplane airplane) : base(airplane)
 {
     Velocity = airplane.Velocity;
     Gas      = airplane.Gas;
 }
示例#2
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 public Grounded(Airplane airplane) : base(airplane)
 {
 }
示例#3
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 public Airborne(Airplane airplane) : base(airplane)
 {
 }