Walls have ears; meaning private conversations might be overheard and leaked.
他们私下谈论公司的变动，小张提醒大家要小心，毕竟窗外有耳，消息传出去就不好了。
They were privately discussing company changes. Xiao Zhang reminded everyone to be careful, after all, walls have ears, and it wouldn't be good if the news got out.
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