Walls have ears, you know.

你要知道，隔墙有耳！

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。

Not so loud. Walls have ears.

不要太大声，隔墙有耳。

Hedges shave eyes, walls have ears.

隔篱有眼，隔墙有耳。