Abstract: Police colleges began to offer the police documental retrieval course in 1986.In the last 20 years, police education has been formalized.是什么意思_Abstract: Police colleges began to offer the police documental retrieval course in 1986.In the last 20 years, police education has been formalized.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句