?备份伞
... 用重心的挪动转移来控制伞(weight shift control) 备份伞(reserve parachute) 充气(inflation) ...
?备用伞
... Relative wind 相对气流 Reserve Parachute 备用伞 Reserve Ride 使用备用伞 ...
Premature deployment of his main or reserve parachute.
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英汉双解词典包含3185865条英汉词条，基本涵盖了全部常用单词的翻译及用法，是英语学习的有利工具。