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知情人;了解內幕者;消息靈通人士
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.'
一位知情人說：“凱瑟琳已告訴朋友準備結束她的事業”。
German banks have more insider knowledge than most.
德國銀行與大多數銀行相比知曉更多的內部消息。