Even the walls have ears 隔墙有耳
Walls have ears, you know.
你要知道，隔墙有耳！
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It's not only because walls have ears but also because it's not a virtue that we should never speaks ill of others behind their backs.
不仅是因为隔墙有耳，还因为这不是一种美德，所以我们才绝应该不在背后说他人坏话。
Hedges have eyes, walls have ears.
隔篱有眼，隔墙有耳。
In the Bolshoi walls have ears.
BBC: Sergei Filin acid attack: Trouble backstage at Bolshoi
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