In the end, it can give up because of sheer exhaustion, when it runs out of the fuel propelling it forward.
最后，它可能会因疲惫不堪而放弃，当它耗尽了推动它的燃料。
2
After the exhaustion of the glycogen reserve, and for the next 2-3 days, fatty acids are the principal metabolic fuel.
在糖原消耗殆尽后的2 - 3天内，脂肪酸担当身体主要的供能来源。
3
The exploitation and utilization of renewable energy is inevitable choice for solving energy and environment issue because of gradual exhaustion of the fossil fuel and serious environment pollution.