1. Thermosetting plastics can withstand high temperatures without deforming or melting.
热固性塑料可以在高温下不变形或融化。

2. The manufacturing process of thermosetting materials involves a chemical reaction that hardens the material and makes it resistant to heat.
热固性材料的制造过程涉及到一种化学反应，使材料变硬并具有耐热性。