taper male threads

例句：

1. 1. The tapered shape ofthe tree is unique.
   这棵树的锥形形状很独特。
2. 2. The tapering endsof the rope are easy to grip.
   绳子逐渐变细的末端很容易握持。
3. 3.The tapering effect of the lens isnoticeable.
   镜头的渐缩效果很明显。