四海為家 [ㄙˋ ㄏㄞˇ ㄨㄟˊ ㄐㄧㄚ; si4 hai3 wei2 jia1]
 to regard the four corners of the world all as home (idiom)
 to feel at home anywhere
 to roam about unconstrained
 to consider the entire country, or world, to be one's own

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