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短语

free fall

['fri:'fɔ:l]
军队 вільне падіння (як частина затяжного стрибка парашута)
运输 вільнопадаючий; вільне падіння
 英语 词库
free fall ['fri:'fɔ:l]
军队, 后勤 Phase of the drop during which the paratrooper or the load falls because of his own weight. It ends when the parachute starts working (FRA); A parachute maneuver in which the parachute is opened, either manually or automatically, at a predetermined altitude. (FRA)
缩写 ff
美国 A parachute maneuver in which the parachute is manually activated at the discretion of the jumper or automatically at a preset altitude (JP 3-17) 亦见 airdrop, air movement, free drop, high velocity drop, low velocity drop
free-fall
: 22 短语, 8 学科
一般1
军队10
建造3
机械工程1
油和气1
爱好和消遣1
航天2
航空3