mainline

/ˈmeɪnˌlaɪn/ 形容词 C1

中文：主线的、主流的

Normal, principal or standard.
Not fundamentalist, charismatic or evangelical. (US)
Of or pertaining to the principal route or line of a railway.
Of or pertaining to a surface-level heavy rail system as distinct from an underground, elevated or light rail one.
Of or pertaining to national or long-distance rail network operators as opposed to urban and suburban operators.
Pertaining to a direct route between two major ports.
Of a sequence of opening moves: being part of a main line ("a standard sequence of opening moves considered to be best play").

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