Definition
A warning that one should be careful about what they say because other people might be listening.
隔板有耳（警告勿在公开场合说话）
We should speak quietly here; walls have ears, you know.
我们在这里应该小声说话；隔墙有耳，你知道的。
Be careful when discussing this in the office, walls have ears.
在办公室讨论这件事要小心，隔墙有耳。
I don't want to say too much here; walls have ears, you know.
我不想在这里说太多；隔墙有耳，你知道的。