When they roughened the material so it wasn't smooth, less than 1 percent of the radiation bounced off.
当他们将材料变得粗糙使得其不再光滑时，仅有少于1%的辐射被反射回来。
3
Those gathered at such events will be hoping that the mission makes it all the way to its conclusion — particularly since it has not been smooth sailing since LCROSS took off from Florida in June.