区的深度 meaning in Chinese

depth of zone

When refrigeration in this temperature range is realized by using single stage refrigerator with mixed refrigerant , not only the structure of the refrigerator is simplified , thus the operation reliability of the refrigerator is increased , but also the refrigerator can operate with a higher thermodynamic efficiency than that of conventional ones
采用单级压缩的混合工质制冷机进行该温区的深度制冷，不但可以使制冷机的结构得到简化，提高制冷机运行的可靠性，而且还可以获得更高的热力学效率。