听力原文： Technicians are making the last-minute preparations for the launch of the U. S. space shuttle Discovery on a flight to the International Space Station. Flight officials with the space agency NASA are aware of storm clouds near the Atlantic coast launch site in Florida, which could postpone the launch. This is the second shuttle flight since Columbia disintegrated on reentry three years ago, killing all seven astronauts on board. Since then NASA has spent hundreds of millions of dollars to correct design flaw that caused a piece of foam insulation to break off from the fuel tank and puncture Columbia's wing. NASA is launching Discovery despite objections by the space agency's chief safety officer and chief engineer. They say the problems with the foam insulation have still not been resolved. Shuttle astronaut Steve Robinson says he is not worried. 'The thing like this happened to every single flight and what's really great -- you remember how much we talked about culture change after Columbia. This is culture change. You are seeing it.' The space agency's chief safety officer ______ NASA's plan to launch Discovery.