gradient mixing device

例句：

1. 1.The gradient of the slope is 20 degrees.
   坡度为20度。
2. 2. The gradient of the road is steeper than that of the nearby street.
   这条路的坡度比附近的街道陡。
3. 3. The gradient of the temperature changes with altitude.
   温度随着海拔的变化而变化。