您要查找的是不是：
- Raising the comprehensive ability of coal mine mechanical involute gear wheel deceleration parachute 提高煤矿机械渐开线齿轮减速器综合性能探讨
- deceleration parachute 减速伞
- Delivery of supplies to a place by parachute. 伞投，空投用降落伞向一个地方投放物资
- When his parachute failed he thought he was a goner. 他的降落伞打不开了，他想他算完了。
- Our first parachute jump was an exhilarating experience. 我们第一次跳伞感到兴奋莫名。
- The parachute puffed all around. 降落伞噗地张开了。
- The airman boldly jumped from the airplane with his parachute. 飞行员带著降落伞勇敢地跳下飞机。
- The airman boldly jump from the airplane with his parachute. 飞行员带着降落伞勇敢地跳下飞机。
- There is usefulness to the parachute. 降落伞是有用的。
- My parachute eased me groundward. 降落伞载着我徐徐下落。
- Supplies were dropped by parachute. 补给品由降落伞空投。
- He has joined up in the Parachute Regiment. 他参加了伞兵团。
- A parachute, such as one for pilots or skydivers. 降落伞飞行员或跳伞者的降落伞
- When his parachute fails he thinks he is a goner. 他的降落伞打不开了，他想他算完了。
- What if the parachute doesn't open? 降落伞打不开怎么办?
- Needing someone is like needing a parachute. 需要某个人就像需要一顶降落
- His backup parachute also failed. 他的备用降落伞也坏了。
- The pilot was able to parachute to safety. 飞行员得以安全跳伞。
- To descend by means of a parachute. 跳伞，伞降用降落伞下降
- He explained how to use the parachute. 他解释怎样使用降落伞。
