内心里in one's heart of hearts
表面上都好，骨子里那就难说了
he looks fine, but it's hard to tell what is going on inside his head
这个人表面上老实，骨子里狡猾
he comes across as an honest man, but deep down he is very crafty
私人之间<方>private matter
这是他们骨子里的事
this is their private business
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