a government police department dealing with political security
例句
用作名词 (n.)
The aide, whose identity is known to The Sunday Times, immediately reported the theft to the prime minister's Special Branch protection team and was informally reprimanded. 这名身份已经被星期天泰晤士时报确认的助手,迅速将这起偷盗案报告给了首相的政治保安处并被非正式的警告。