Because eating frequent meals prevents dips in blood glucose, the primary energy source for the brain.

因为多餐制可以预防血糖下降，血糖是大脑原始能量的提供者。

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Lactic acid is a by-product of the body's metabolization of glucose, which is the primary energy source for running.

乳酸是身体葡萄糖代谢的副产品，而葡萄糖是跑步的主要能量来源。

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Most of the rest of the investment will have to go to exploring and developing new sources of oil, which will remain the world's primary energy source for decades.

其余的大部分资金将用于新油田的勘探和开发，未来几十年中石油仍将是世界的基础能源。

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In reality, what they wanted to replace was not the grid, but rather the primary energy source.

FORBES: The Good Grid and why bragging about being "off the grid" is silly

In July, Denmark announced plans to deploy the world's most extensive smart-grid infrastructure, which could make distributed energy the country's primary source of electricity before long.

FORBES: The Answer To The Energy Problem

You can bet that the Chinese master planners are not considering energy jobs as the primary or long-term source of employment, green or otherwise.

FORBES: Clean Energy Driven Job Growth Is A Return To The Stone Age