the situation of H1N1 is very severe throughout the world, but scientists have carefully invented a vaccine for it. as the vaccines have been sent to more cities, more people's lives are saved.the world is in progress, and so are science and technology
A flow of the world now have more serious disease, scientists have carefully developed a vaccine a stream, with a flow of the vaccine have been delivered to more cities, more people received treatment. The world in the development of science and technology are developing.
