under utilization短语¹¹⁴⁴⁶⁷⁺⁴ 基本例句 经未充分利用 In conclusion, both readily available nitrogen and soil bulk density are sensitive to grazing levels, and can be used in quantitative determination of grassland succession under utilization. 土壤速效氮、土壤容重对放牧的响应敏感，可以定量反映草原利用演替状况。 cnki