关键是备份伞在任何速度下都要有效的打开。
The bottom line is that the parachute must open correctly at any speed.
如果真的遇到主伞问题，我们需要切掉主伞，打开备份伞。
If you really have the main umbrella, we need to cut off the main umbrella, open the parachute.
我们的整套跳伞系统里面，包含一个主伞一个备份伞和一个自动开伞器。
Our entire parachute system includes a main umbrella, a backup parachute and an automatic umbrella.
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