decompression  
noun [ U ] uk/ˌdiː.kəmˈpreʃ.ən/ us/ˌdiː.kəmˈpreʃ.ən/
  (PRESSURE)         
  减压;失压,卸压
a reduction in pressure around someone or something
  Decompression due to altitude has physiological effects. 海拔变化带来的失压会对生理机能产生影响。 
  medical specialized(为身体器官)减压,解压 
removing harmful pressure on part of the body
  cardiac/cerebral decompression 心脏/脑减压 
   (DATA)      
  computing specialized(使文件恢复原本大小的)解压缩 
the process of returning or allowing something to return to its original size
  data decompression 数据解压缩 
   (RELAXATION)      
 mainly US informal放松 
the process of relaxing
  Last weekend we were all in need of a little decompression. 上个周末我们都需要放松一下。