Sign around us.
With more rules existing,signs are becoming common to everybody.
It is easy for us to find the "no somoking" signs on the underground and in theatres.
Moreover,there are signs stand for different directions on the road and distinct bans for every circumstance.
For example,there may be a "throw in" sign beside a rubbish bin,and a "dangerous" sign on the side of a deep swimming pool.
Signs around us are important because they tell us what we should or shouldn't do at the moment.
Every citizen is obliged to obey signs around us.