It may require warming a planet's surface, introducing oxygen to its atmosphere and creating a water supply, among other massive undertakings.

在众多的巨大工程里面，或许还包括加热行星表面，为大气层输氧，创造水源等等艰巨任务。

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Surface water resources is changed with water supply sources, but water supply sources can be changed by human activity.

地表水资源量的变化是随着补给源补给量的变化而变化的，人类活动可以改变地表水的补给源。

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Select a location near the fixture that this water heater will supply. The water heater must be installed indoors and in a vertical position on a level surface.

选择这个热水器所要供水的用具附近的位置。这个热水器必须在室内的水平地面上立式安装。

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The firm said strong currents might also lurk beneath the surface as water was drawn into the supply network.

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Surface water sources, such as reservoirs and rivers, provide about 90% of the region's water supply.

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