with vertical grooves
有垂直凹槽
以上为机器翻译结果，长、整句建议使用 人工翻译 。
The outer circle of the vertical pole is provided with a guiding elongated slot, and the slot base of the guiding elongated slot is processed with two small grooves which are respectively arranged.
立柱的外圆上设有一导 向长槽，在导向长槽的槽底加工有二个分别设置的小凹槽。
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