a fecund soil的用法和样例：
- They have a fecund soil.
- The tea grows well in the mountain with fecund soil.
- The contents of coffeic acid and chlorogenic acid in different producing areas were very different,which in fecund soil was better.
- This is a fecund land, this is the hot earth that just is full of a hope.
- There are a lot of worms in the soil.