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知情人;了解内幕者;消息灵通人士
An insider is someone who is involved in a situation and who knows more about it than other people.
例句
An insider said, 'Katharine has told friends it is time to end her career.'
一位知情人说：“凯瑟琳已告诉朋友准备结束她的事业”。
German banks have more insider knowledge than most.
德国银行与大多数银行相比知晓更多的内部消息。