The points for attention in designing the serration axle are pointed out.
指出了渐开线螺旋花键轴几何尺寸设计时应注意的问题.
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Cut the edge of the card by pinking shears to make serration or wave patterns.
再使用造形剪刀将卡片的边缘剪成锯齿或波浪状,以增加美感.
"the serrations of a city skyline"
"the pliers had serrations to improve the grip"
"one of the serrations was broken off"
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