压缩循环 meaning in English

compression cycle

Two - stage compression cycle for water heaters in air source heat pumps
空气源热泵热水器双级压缩循环研究
Test method for building sealants part 14 : determination of resistance to prolonged exposure to water
建筑密封材料试验方法第14部分:浸水及拉伸?压缩循环后粘结性的测定
Test method for building sealants part 12 : determination of adhesion cohesion properties at constant temperature
建筑密封材料试验方法第12部分:同一温度下拉伸-压缩循环后粘结性的测定