It cannot be changed. The expression comes from the idea that water that has fallen over a dam cannot be brought back again.

VOA: special.2009.05.10

About a 45-minute drive north of Vancouver, it has been hit with unseasonably warm temperatures that have brought rain and destroyed much of the existing snow.

VOA: standard.2010.02.16

It is also the stronghold of the red-shirt movement, which has brought downtown Bangkok to a halt in two months of protests that have seen repeatedly turned violent.

VOA: standard.2010.05.14

Key playerThis year,China's economy is expected to grow by more than eight percent, and its overall resilience to the global financial crisis, has brought with it increasing confidence in the international arena.

VOA: standard.2009.11.10