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tunnel ['tʌnl] v
comp., MS	通道 (A logical connection over which data is encapsulated. Typically, both encapsulation and encryption are performed, and the tunnel is a private, secure link between a remote user or host and a private network)
English thesaurus
tunnel ['tʌnl] v
IT	The paths that the encapsulated packets follow in an Internet virtual private network (VPN)

tunnel : 2 phrases in 1 subject

Microsoft

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