- 1. 我将要介绍的第一类边框是凸边或凹边。
- The first type of frame I will show you is a raised or lowered border.
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- 2. 桶的凸边必须用机械方法接合，或焊接。
- Chimes shall be mechanically seamed or welded.
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- 3. 有一个小小的在打开的调整偏差看到右上角有凸边的旋钮。
- There is a small knurled knob at the top right of the sight that is turned to adjust the windage.
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- 4. 有一个小小的在打开的调整偏差看到右上角有凸边的旋钮。
- There is a small knurled knob at the top right of the sight that is turned to adjust the windage.
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