direct inward dialing直接: direct; immediate拨入: dial-in; dialing in小: small; little; petty; minor交换机: exchange board; switchboard分机: extension下载手机词典可随时随地查词查翻译关注微信公众号：chachacidian，回复:直接拨入小交换机分机，即可在微信中查询翻译
