They focus on keeping their soil rich and free of diseasefree of disease 做什么成分?

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Theyfocusonkeepingtheirsoilrichandfreeofdiseasefreeofdisease做什么成分?Theyfocusonkeepingtheirsoilrichand

They focus on keeping their soil rich and free of diseasefree of disease 做什么成分?
They focus on keeping their soil rich and free of disease
free of disease 做什么成分?

They focus on keeping their soil rich and free of diseasefree of disease 做什么成分?
他们把精力放在使他们的土壤肥沃和消灭病毒 是宾语是on 的宾语

做宾补 keep做动词 their soil 做宾语 rich 和free of disease 做宾补