土壤中的有机碳是土壤是否能够保持湿度，提供营养和维持生产能力的重要指标。

Soil organic carbon is a key indicator of how well soil will hold moisture, provide nutrients, and remain productive.

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当创造的价值通过更高的产品质量、生产能力和顾客满意度以及其他方式得以维持时，就会发生价值保持。

Value preservation occurs where created value is sustained through, among other things, superior product quality, production capacity, and customer satisfaction.

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在平衡紧张和商业石油库存量仍然较低的情况下，去年的各种价格信号清楚地说明了维持生产和扩大生产能力的必要性。

With a tight balance and commercial oil stocks still relatively low, price signals over the past year have made clear the need to sustain production and expand capacity.

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