lubricating oil viscosity

例句：

1. 1. The oil's viscosity is a critical factor in determining itsperformance.
   油的粘度是决定其性能的关键因素。
2. 2. The thicker the viscosity, the more difficult it isto mix the ingredients.
   粘度越厚，混合原料就越困难。
3. 3. The viscosity of the liquid can affect its flowrate and how easily it can be poured.
   液体的粘度会影响其流动速率以及是否容易倾倒。