名词
中文翻译：呼叫器
同义词：
['call counter', 'call box', 'call plate例句：1. The call meter on the wall shows that we have made 50 calls today.（墙上的呼叫器显示我们今天打了50个电话。）']
例句：
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1. The call meter on the wall shows that we have made 50 calls today.
墙上的呼叫器显示我们今天打了50个电话。
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2. The engineers used a call meter to measure the power consumption of the new machine.
工程师们使用一个呼叫器来测量新机器的电力消耗。
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3. The call meter was installed in the lobby to monitor the usage of the elevator.
在大厅安装了一个呼叫器来监控电梯的使用情况。