optimum factor combination

例句：

1. 1. The optimumtemperature for growing flowers is between 20°C and 25°C.
   花卉生长的最佳温度是20°C到25°C之间。
2. 2.The optimum level of education requiredto achieve this goal is a bachelor's degree.
   为了实现这一目标，所需的教育水平是学士学位。
3. 3. The optimummix of nutrients in the soil is crucialfor plant growth.
   土壤中养分的最佳混合比例对植物生长至关重要。