blood and iron

例句：

1. 1. The blood and ironin the soil are essential for plant growth.
   土壤中的血液和铁对植物生长至关重要。
2. 2. The iron in the soil is crucialfor plant growth.
   土壤中的铁对植物生长至关重要。
3. 3. The blood and iron in thesoil play a vital role in plant growth.
   土壤中的血液和铁在植物生长中起着至关重要的作用。