No air bubbles were present in the green ice, suggesting that the ice was not formed from the compression of snow but instead from the freezing of seawater.
绿色冰层中不含气泡，这表明了这种冰层是由冻结的海水形成的，而不是凝结压紧的积雪。
Biogas engine-driven heat pump (BHP) not only has the same functions of compression heat pump, but also can utilize the waste heat recovery from biogas engine.
由沼气发动机驱动的热泵(BHP)除能够保证一般热泵功能外，还能够充分回收利用沼气发动机的余热。
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