Every year, nearly a million children in the world die because of unintentional injuries（意外伤害）, and the biggest killer is the traffic accident, according to a report from the Worldwide Health Organization.
The report says that traffic accidents, falling into water, fires, falls, and poisoning（中毒）are the five major causes of unintentional injuries. About 830000 children under 18 die and millions of children are injured every year.
The World Health Organization finds that roads are the most dangerous places for children, especially in developing countries. Because children in these countries haven't learned about the dangers of road traffic, they are often not ready for the new roads that might be built through their villages.
In Asia, deaths are most often caused by bikes. It is usual to see a whole family on one bike in counties such as Vietnam. When they are knocked over, they will be badly injured and some may even die.
In the United States and other Western countries, injuries from road traffic accidents have been cut down through the use of safety seats for children and other safety measures. However, traffic accidents are still a major cause of deadly（致命的） injuries.
