tip die-back

例句：

1. 1. The car's front bumper is made of ahard plastic material.
   这辆车的前保险杠是由硬质塑料制成的。
2. 2. The engineer carefully removedthe tip die-back from the machine.
   工程师小心翼翼地从机器上拆下了尖端部分。
3. 3. The new model features a sleek andstylish tip die-back design.
   新款模型拥有光滑且时尚的尖端设计。