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不稳定土
1、soil───n.土地；土壤；国家；粪便；务农；温床；vi.变脏；vt.弄脏；污辱
2、oxygenate soil───含氧土壤
3、calcine soil───煅烧土
4、untilled soil───未耕地
5、cumulose soil───植积土
6、overlying soil───上覆土
7、crescive soil───新月土
8、erratic───n.漂泊无定的人；古怪的人；adj.不稳定的；古怪的
9、poorer soil───贫瘠的土壤
1、Because of the erratic rainfall patterns in Australia, it is often considered that soil moisture sets the upper limit on crop yield potential.───由于澳大利亚降雨类型多变，人们常认为土壤水分给作物产量定了上限。
2、Climate change will also be a multiplier of poverty, as increasingly erratic weather induces more drought, flooding, erosion and soil degradation.───气候变化也将导致贫困倍增，因为越来越不规则的天气现象导致更多的干旱、洪水、水土流失和土壤退化。