Method for reducing the formaldehyde emission of a composition containing a formal by adding urea, urea derivatives, amino acids, guanidine or guanidine derivatives. The hollow body has a front, a rear, a crown and a sole. An illumination assembly includes a light source and a frame disposed in the imaging compartment. Thus, a user may interact with a mobile telephone using an interactive TV system by displaying textimage data received from the telephone and by inputting various telephone function commands using a remote control unit. The method includes presenting nodes corresponding to components of the entity according to a tree-like configuration, and providing condition information associated with at least one of the components using the nodes. Accordingly, an efficient devolatilization operation of the material is achieved.