serrated ring spanner 细齿环形扳手
serrated range ring 锯齿形测距圈
·2,447,543篇论文数据，部分数据来源于NoteExpress
Another convenient feature of the models in the m series is the serrated bezel ring, which is easy to turn even in cold conditions while wearing gloves.
另一个在M系列机型的特点是方便锯齿状挡板圈，这是很容易把在寒冷的条件下，甚至戴着手套。
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