The present so called sustainable usage of resources is only a relative one and its specific denotation is elucidated.

认为现阶段所谓资源持续利用，只是相对的资源持续利用，并说明了具体含义。

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Is the memory usage sustainable over a long period?

内存使用情况是否能长期维持？

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The movement aims to raise awareness of environmental problem caused by the heavy usage of cars in urban areas, and to promote bicycles as a cleaner and more sustainable mode of transport.

他旨在呼吁人们意识到城市的区大量用车所导致的环境问题，提倡更为洁净、更为持续的自行车出行方式。

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"The operating success of this year is based on sustainable and profitable subscriber growth, longer usage times and more revenues in advertising, e-commerce and services, " the company said in a statement.

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