In the picture, we are amazed to find that . It clearly tells us that in the domain of , there are .
has long been a problem since , and are turning to be an increasingly severe problem because of . Besides, there are more reasons responsible for this issue. Firstly, . Secondly, . Thirdly, .
Judging from the analysis above, we may safely come to the conclusion that the daunting problem demands effective counter-measures. Most importantly, the government needs to implement sufficiently relevant laws and regulations in order to enhance the strength of . In addition, all residents should be aware of .
