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.

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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.

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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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