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   English ⇄
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subscriber trunk dialing
busin. 用户直通长途电话
el. 用户中继线拨号
IT 用户干线拨号
multimed. 用户干线［中继线］拨号
telecom. 用户长途拨号
 English thesaurus
Subscriber Trunk Dialing
abbr. STD (British, and elsewhere; equiv. DDD in USA)

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