commonly是副词修饰整个句子,主句是fields are natural home to frogs.非限制性定语从句where they enjoy a comfortable life feeding on pest harmful to crops修饰fields.动名词分句helping solve the big headache of farmers做定语修饰前面的从句.
commonly是副词修饰整个句子,主句是fields are natural home to frogs.非限制性定语从句where they enjoy a comfortable life feeding on pest harmful to crops修饰fields.动名词分句helping solve the big headache of farmers做定语修饰前面的从句.