Conventional vent lines are removed and replaced with a vent loop of high strength polymer textile braids.
该项技术去掉顶孔绳，代之以高强编织带孔口圈。
This paper presents a new vent loop technology for annular parachutes developed in USA in recent years.
文章介绍了美国近年来研究的降落伞中的一项新技术—圆形降落伞顶孔的孔口圈技术。
This paper presents a new vent loop technology for annular parachutes developed in USA in recent years.
文章介绍了美国近年来研究的降落伞中的一项新技术—圆形降落伞顶孔的孔口圈技术。
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