单词：ripcord
n. a cord that is pulled to open a parachute from its pack during a descent
ripcord的用法和样例：
例句
- What would you use a ripcord to pull open?你用拉伞索时需打开什么？
- Its ripcord can be attached to heavy furniture or a special hook so that the parachute opens automatically after its wearer jumps out a window.降落伞的开伞索可以绑在重家具或是特制的钩子上，带上这种降落伞的人一旦跳出窗外，降落伞便会自动打开。
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