soil injection

例句：

1. 1. The engineer injectedthe chemical into the soil to test itseffectiveness.
   工程师将化学剂注入土壤以测试其有效性。
2. 2. The farmers used soil injectionto improve the fertility of theircrops.
   农民使用土壤注射来提高作物的肥力。
3. 3. The scientist conducted soil injectiontests on different types of soil.
   科学家对不同类型土壤进行了土壤注射测试。