• 1. primary energy source: 一次能源 | 初级能源
• 2. primary chemical source of energy: 初化学能源

• 1.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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• 2.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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• 3.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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