Moisture is held in the center layer of the skin. 水分保持在皮膚的中間皮層中。
Considering these phenomena, it is obvious that fertilizer is an essential component for an effective soil and water conservation programme on sloping lands. 考慮到這些，很顯然，在坡地土壤有效的土壤和水分保持計劃中，肥料是一項重要的組成部分。
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