It is subtly revealed in the caricature that a son is expressing his concern about disposing of nuclear waste to his father,while his father asked him to empty dustbin first.This thought-provoking portrayal illustrates to us the significance of doing small things before undertaking something and reminds us of an old Chinese saying,"Sweeping your own house before conquering the world."
  In the first place,through doing small things,we accumulate precious experience and essential skills,which help us to get better prepared for any upcoming things.In the second place,doing trivial matters helps us to develop good habits,such as perseverance and patience,with which we won't give up or escape easily when confronted with bigger difficulties.
  Admittedly,it is reasonable for us to aim high and be ambitious,but before we are to undertake something big,we should try our utmost to fulfill simple tasks such as empty the dustbin.