Sign up for
Participate with your entry in one of our professional or student awards.Sign up for an award
You are using an outdated browser. Please upgrade your browser to improve your experience.
Lost control vertical landing in the
elevator, the elevator at the bottom
will open a larger balloon weakened
lift the rate of decline at the same
time , harm reduction in the elevator
plunging to the ground.
Wenxin Xu，Jian Xiong，Zhengpan Li，Chen Guo