1. It is the system's constant hum that reassures passengers the air is still OK.
2. reassures
2. The clean white lab coats and anatomy charts on the wall reassures you that your qi will flow more healthily.
3. At the very least, the just unveiled roadmap of government reform reassures us the direction is right.
4. The Obama administration reassures China that it will not contain China's rise, but it is actually trying its best to do just that.
5. Zhou reassures visitors to next month's World Expo that they can expect relief from long queues.