The officer records all received emergency calls in the blotters every day.

blotters 是 blotter 的复数形式。blotter 原指"吸墨纸"，后来引申为"记录簿"，因为过去常用吸墨纸来记录临时信息。在警察术语中，blotter 特指"警方日常案件登记簿"。