The outer surface of the guide post is in a wavy shape matched with the arc-shaped inner concave head form top to bottom.

导柱外表面自上而下呈与弧形内凸头配合的波浪状。

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The outer surface of the guide post is in a wavy shape matched with the arc-shaped inner concave head form top to bottom.

导柱外表面自上而下呈与弧形内凸头配合的波浪状。

youdao