最主要的原因是他们在自由下降阶段或者降落伞打开后，撞到了山上。

Hitting the mountain while free-falling or after the parachute deploys is a common cause.

youdao

最主要的原因是他们在自由下降阶段或者降落伞打开后，撞到了山上。

Hitting the mountain while free-falling or after the parachute deploys is a common cause.

youdao