re-entrant mold

例句：

1. 1. The new design of the machine has made it more efficient and re-entrant molds are used to make parts for it.
   机器的新设计使其更高效，使用再入模制造零件。
2. 2.In the manufacturing process, re-entrant molds are used to produce complex shapes without the need for expensive tooling.
   在制造过程中，使用再入模可以生产复杂的形状，而无需昂贵的工具。
3. 3.The engineers developed a new method to reduce waste by using re-entrant molds in the production line.
   工程师们开发了一种新的方法，通过在生产线中使用再入模来减少浪费。