central office
collocation电话交换局
The new central office will handle thousands of phone lines.
新的电话交换局将处理数千条电话线路。
电话总机；电话交换局
先理解核心含义，再看它在真实句子里的用法。
电话总机；电话交换局
a telephone exchange or switching center where phone lines are connected
The central was busy, so I had to wait for the operator to connect my call.
电话总机很忙，所以我不得不等待接线员为我接通电话。
作为电信设施的工作场所,电话线可在此连接以实现通信
a workplace that serves as a telecommunications facility where lines from telephones can be connected together to permit communication
Please report the fault to the central if your phone line keeps crackling.
如果你的电话线路一直有杂音，请向电话交换局报告故障。
Every call in the building passes through the central before reaching the other line.
这栋楼里的每通电话在到达对方线路之前都要经过电话总机。
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电话交换局
The new central office will handle thousands of phone lines.
新的电话交换局将处理数千条电话线路。
本地电话交换局
When you dial a neighbor, the call is connected by the local central.
当你拨打电话给邻居时，电话由本地电话交换局接通。
Use central naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
把 central 想成“中心局”：所有电话线都汇聚到这个中心，像蜘蛛网的中心一样，“中”音近 cen。记住：central 作名词是电话交换总机。
语域：formal 常见场景：电信工程、历史资料 此义通常用于电信或历史语境，比较正式；日常口语中较少单独使用，更常说 telephone exchange。
真正押韵的词：ventral /ˈvɛntrəl/。拼写上以 -tral 结尾的 neutral /ˈnuːtrəl/ 和 spectral /ˈspɛktrəl/ 并不同韵（元音不同）；entrance /ˈɛntrəns/ 和 entry /ˈɛntri/ 只共享开头的 /ɛntr/；center /ˈsɛntər/ 只共享开头的 /sɛn/。
Dictionary facts from DICTIONARY_API_DEV, ECDICT, WIKTIONARY.