4. a direct link, rising levels of obesity
e.g. I believe that there is a direct link between fast food advertisements and the rising levels of obesity.
5. be used for sth., clean-up operation, pleasant environment
e.g. The government funds can be used for clean-up operation, which can help create a pleasant environment.
6. censor, buy more than they need
e.g. It is necessary to censor some advertisements which encourage consumers to buy more than they need.
