求翻译：当前，脉管制冷机正向着微型化和实用化方向发展，中、日、法、德、美、荷等国家研制出了不同结构的脉管制冷机，在低温区，目前所报道的最低温度可以达到1.78K，同时第一台制冷量为0.5W并且温度为4.2K的商用脉管制冷机已经在美国的Cryomech低温设备公司问世，对于液氦区，脉管制冷机的性能有的已经达到了斯特林机的水平。是什么意思？

At present, the pulse tube refrigerator is toward miniaturization and practical direction, China, Japan, France, Germany , the United States , the Netherlands and other countries developed a pulse tube refrigerator with different structures , in the low temperature region , currently the lowest temp

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Presently, the vessel refrigerator is developing to the microminiaturization and the practical direction, countries and so on date, law, Germany, America, Holland developed the different structure vessel refrigerator, in the low temperature area, the lowest temperature which reported at present may

Current, pulse tube refrigerator are toward micro of and practical of direction development, in the, and day, and method, and de, and beauty, and Dutch, national developed out has different structure of pulse tube refrigerator, in cryogenic district, currently by reported of minimum temperature can

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