free-fall自由投放;自由落下;自由降落;自由落体
free-fall insertion自由下落插入
free-fall time自由下落时间
free-fall height自由下落高度;自由降落高度
free-fall anchor自由抛落锚
free-fall descent自由降落
free-fall boring重力冲击钻进
free-fall aerator自由跌落曝气器
free-fall ride自由落体车乘
N-VAR（有变体名词） If the value or price of something goes into free fall, it starts to fall uncontrollably. (价值或价格的)自由跌落 [journalism] [oft 'into/in' N]
Sterling went into free fall.
英镑陷入了自由跌落。
N-UNCOUNT（不可数名词） In parachuting, free fall is the part of the jump before the parachute opens. (跳伞中的)自由落体环节