concealed是动词conceal的过去式和过去分词。该词表示“隐藏,掩盖”。例如:Frances decided to conceal the machine behind a hinged panel.弗朗西丝决定把那台机器藏到一块可开合的镶板后面。Robert could not conceal his relief.罗伯特掩饰不住自己如释重负的心情。Tim could barely conceal his disappointment.蒂姆几乎掩饰不住自己的失望。