The public service advertising is taken by Jiang Wen,to remind the masses don't eat shark's fin and to achieve shark conservation.
The advertisement is used to ask a question giving rise for thought,then,to express their views with animation.And,the end of the advertisement,he speaked,"humans don't eat shark's fin can live very good,but shark don't have shark's fin can die."The represented view of the advertisement is no sale no harm.
Different people understand this advertisement differently.Every parents are looking forward to teach their children to take care of animals especially endangered wild animals.But the old man,they will eat the shark's fin if they think the shark's fin are benefit for them. In my view,crasping the shark is a very cruel thing.After then,I don't eat the shark's fin more.And author communicated his purpose effectively,clearly and consistently.