人工电话局的英文

• manual central office
• manual exchange
• manual telephone exchange

• 人工:    artificial manual work; work ...
• 电话局:    telephone exchange
• 人工电话:    manual telephone system◇人工电话机 manual telephone set; 人工电话交换机 manual telephone switch; manual exchange; 人工电话局 manual exchange; 人工电话系统 manual telephone system
• 人工电话机:    manual telephone set
• 人工电话区:    manual area