然后再一次加热。
之后再通过另一跟导管返回地表进行另一次加热。
The hot water from the street runs through them, warming the groundwater, before returning to the surface via another pipe.
对含有内部裂纹的45钢试样采取了不同温度一次加热正火处理和二次加热正火处理，研究了其内部裂纹愈合的可能性。
The possibility of inner microcrack healing was studied by normalizing the 45 steel samples containing inner crack for one time and two times respectively.
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