surface instability

例句：

1. 1. The new design has asurface instability that causes the productto crack easily.
   新设计的表面不稳定性导致产品容易开裂。
2. 2. The researcher found thatthe surface instability of the materialcould be improved by adding a small amountof plasticizer.
   研究人员发现，通过添加少量增塑剂可以改善材料的表观不稳定性。
3. 3. The stability of the material iscritical for its application in engineering structures.
   材料的稳定性对于其在工程结构中的应用至关重要。