呼叫者

例句：

1. 1. The police are investigatingthe incident as a possible act of terrorism.
   警方正在调查这起事件是否为恐怖袭击。
2. 2. The caller was asked toleave immediately after being identified.
   被识别后，来电者被要求立即离开。
3. 3. Thecaller hung up without saying goodbye.
   来电者挂断电话时没有道别。