In usual crystalline materials, one finds an inverse relation between the two properties, as for many practical applications, simultaneous presence of both properties is desirable.

 
  • 在普通的晶体材料中,人们会发现这两种性质之间的相反关系,但是对于许多实际应用来说,两种特性的同时存在才是人们所追求的。
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