For any system where you have quantized level, you can always eventually get to a low enough temperature that you're in the first limit.
对任何有量子化能级的系统，你最终总能达到，足够低的温度，达到第一个极限。
You, like the sun, have a temperature that I can't get close to.
你和太阳一样，都有着我所不能靠近的温度。
As two means to get a low temperature, two-stage compression cycle and cascade cycle have their advantages of economical performance in different temperature range.
对于获取低温的两种手段—双级压缩循环和复叠循环来说，它们分别在不同的温区具有经济性优势。
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