gradient solvent

例句：

1. 1. The temperature gradient between the two regions is significant.
   两个地区之间的温度梯度是显著的。
2. 2.The gradient of the soil profile is critical for plant growth.
   土壤剖面梯度对植物生长至关重要。
3. 3. The gradient of light intensity varies with the distance from the source.
   光强度的梯度随着距离光源的距离变化而变化。