Superconductors only work at extremely low temperatures, rendering them practically useless because the energy used to cool them to those temps cancels out the benefit of no energy loss.
超导体只在极低的温度下发挥作用，几乎可以认为它们没什么用，因为那些用于将它们降到极低温度所消耗的能量抵消了其不产生能量损失的优势。
Burnout was defined as having one of the following symptoms: loss of enthusiasm for work, feelings of cynicism, and a low sense of personal accomplishment.
职业倦怠定义为具有下列症状之一：丧失对工作的热情，玩世不恭，和没有个人成就感。
If the pump noise at work, this is often due to low oil temperature, oil viscosity is too high, the oil into the air, or pump coupling loss causes such as excessive wear and tear.
假如泵在工作时产生噪音，这往往是因油温太低，油液粘度太高，油液中进入空气，联轴节失中或泵过度磨损等原因引起。
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