initial gradient

例句：

1. 1. The initial gradient of theslope is steeper than the final one.
   斜坡的初始斜率比最终斜率陡峭。
2. 2. The initial gradient of the temperature changeis significant.
   温度变化初始斜率是显著的。
3. 3. The initial gradient of the road issteep, so it's easy tofall off.
   道路的初始坡度很陡，所以很容易滑下去。