viscosity-controlling agent

例句：

1. 1.The oil is used to control the viscosity of the mixture.
   这种油用来控制混合物的粘度。
2. 2. The new additive is designed to improve the viscosity of the paint.
   这种新的添加剂被设计来提高油漆的粘度。
3. 3. Viscosity control is crucial for maintaining the stability of the fluid.
   粘度控制对于保持流体的稳定性至关重要。