我们只有把reflog中的相关记录也删除掉，仓库中的悬空对象(dangling objects)就没有任何引用(ref)指向它，git gc –prune=0才会执行成功。
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Reach for dangling objects 伸手去够挂件
This means they can lift improbable objects into the sky, such as dangling radar equipment.
这就意味着它们可以把原本不可能的物体带上天空，比如悬空雷达设备。
Jazz enforces referential integrity between an item and its helper objects, but not between items; i.e., dangling item references are allowed.
Jazz强制项与其Helper对象之间的引用完整性，但是不强制项之间的引用完整性；也就是说，悬空项引用是允许的。
From reliefs she moved to objects, using papier mache, paint, tubing, dyed nets and dangling string.
从浮雕她搬到对象纸型，采用造纸，涂料，管材，染网和摇摇欲坠的字符串。
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