Even in safe areas, however, moving water can always present risks -- such as when a swimmer attempts to stand up on a rocky riverbed in strong current, risking foot entrapment.

• 然而，即使在安全区域，流动的水会经常构成危险，例如当一个游泳者试图站在水流很强的多岩石的河床上时，脚有陷下的危险。