useful energy的用法和樣例:
例句
- A jet plane before takeoff has a certain store of available energy in its fuel.
噴氣式飛機起飛前已在燃料中貯存了一定的可資用能。
- The State shall exercise strict administration of energy conservation in key energy-using units.
第二十條國家對重點用能單位要加強節能管理。
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