Children cool off themselves on a firefighting boat on the Hudson River in New York, the United States, Aug. 5, 2012. New Yorkers have experienced the scorching heat for several days as a new round of heat wave hit the city. (Xinhua/Wang Lei)

Children cool off themselves on a firefighting boat on the Hudson River in New York, the United States, Aug. 5, 2012. New Yorkers have experienced the scorching heat for several days as a new round of heat wave hit the city. (Xinhua/Wang Lei)

A boy jumps into the Hudson River to cool off himself in New York, the United States, Aug. 5, 2012. New Yorkers have experienced the scorching heat for several days as a new round of heat wave hit the city. (Xinhua/Wang Lei)

A man jumps into the Hudson River with his son to cool off themselves in New York, the United States, Aug. 5, 2012. New Yorkers have experienced the scorching heat for several days as a new round of heat wave hit the city. (Xinhua/Wang Lei)

A boy jumps into the Hudson River to cool off himself in New York, the United States, Aug. 5, 2012. New Yorkers have experienced the scorching heat for several days as a new round of heat wave hit the city. (Xinhua/Wang Lei)