(单词翻译:单击)
石沉大海 -------- sink into oblivion例句：A: Can you get in touch with her for me?你可以帮我和她联络上吗？B: I'm terrible sorry. She got lost and her whereabouts sink into oblivion.很抱歉。她失踪了，她的行踪也石沉大海。
