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。
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。
Mine mouth power plant can directly convert primary energy source into secondary energy, reducing coal loss in the transportation and environmental pollution, so it has tremendous advantages.
坑口电站可以直接将一次能源转化为二次能源，减少输煤损失和环境污染，具有很大的优势。
Mine mouth power plant can directly convert primary energy source into secondary energy, reducing coal loss in the transportation and environmental pollution, so it has tremendous advantages.
坑口电站可以直接将一次能源转化为二次能源，减少输煤损失和环境污染，具有很大的优势。
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