开伞索

例句：

1. 1. He had to unwind the parachute cord before jumping out of the plane.
   他必须在跳伞前解开降落伞的绳索。
2. 2. The pilot carefully controlled the parachute cord as they descended into the valley.
   飞行员小心地控制着降落伞的绳索，他们缓缓下降到山谷中。
3. 3. The rescue team used a special cord to fasten the survivors to the helicopter.
   救援队使用一种特殊的绳索将幸存者固定在直升机上。