taper female threads

例句：

1. 1. The company is tapering its spending to save money.
   公司正在减少开支以节省资金。
2. 2. The tapered edges of the spoon make it easy to hold.
   勺子的渐缩边缘使得握持变得容易。
3. 3.The tapered shape of the tree trunk helps it grow straighter.
   树根的渐缩形状有助于它长得更直。