viscosity index constituents

例句：

1. 1. The studyof the properties of fluids is essential for understanding the behavior of materials in practical applications.
   研究流体的性质对于理解材料在实际应用中的行为至关重要。
2. 2. The researchers used a high-speed camera to capture the flow patterns of the liquid during its movement.
   研究人员使用高速摄像机捕捉了液体在运动过程中的流动模式。
3. 3. The viscosity index constituents play a crucial role in determining the rheological properties of the material.
   粘度指数成分在确定材料的流变学性质中起着关键作用。