弯口钩环能够很快速又轻易的把绳子扣入，常用在快扣的挂绳端。
Bent-gate carabiners are designed for fast , easy clip-ins . They 're used on the rope end of quick draws .
上颌窦口解剖与切除钩突治疗慢性化脓性上颌窦炎
The Anatomy of Maxillary Ostium and Treatment of Chronic Sinusitis by Removing the Uncinate Process
口钩