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