In a telephone switching system,inability to make a connection or obtain a service because the devices needed for the connection or service are in use.
英
美
- 在电话交换系统中,由于需要连接或服务的设备正在使用而不能连通或得到服务。
- 今日热词
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- 深远海浮式风电平台 - deep-sea floating wind power platform
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- 京雄高速公路 - Beijing-Xiongan expressway
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- 农业及相关产业增加值 - the added value of agriculture and related industries