*a country poor in minerals 缺乏矿产的国家 * soil poor in nutrients 缺少养分的土壤. 3 (a) not good; inadequate, esp in contrast with what is usual or expected 不好的, 不充分的, 不足的（尤与一般的或所期望...
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They sustained this dense settlement through raised field agriculture, a technique that improved drainage and recycled nutrients in the poor tropical soil.
高地农业技术可以改善贫瘠的热带土壤的排水和养分的循环利用。
Soil amelioration and ample supply of nutrients in the form of fertilizers is needed to convert poor soils into productive agricultural land.
土壤改良和增施肥料可使这些土壤逐步转变成具有农业生产力的土壤。
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