名词
中文翻译：呼叫指示器
同义词：
['call signal', 'call indicator', 'call signal indicator']
例句：
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1. The call indicator is used to indicate the location of a call.
呼叫指示器用于指示呼叫的位置。
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2.The call indicator was designed to improve the efficiency of the system.
呼叫指示器旨在提高系统的效率。
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3. The call indicator displayed on the screen indicated that there was a problem with the connection.
屏幕上显示的呼叫指示器表明连接存在问题。