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Exhaust gases are generated from the combustion chamber after the air-fuel mixture is burnt through the Power Stroke. These exhaust gases are "thrown out" in the combustion chamber through the Exhaust Stroke. The exhaust gases, including NOx, move through the Exhaust Valve, the Exhaust Passages and finally towards the atmosphere over the Exhaust System. We are living in the century of globalization, and English is viewed as an international language. In high school, studying other languages like Spanish, French, German or Latin are just subjects and that we can forget it when finishing the course. Nonetheless, in these days, Chinese is developing detail by detail and becomes considered one of interesting subjects in high school and college. Furthermore, a great number of learn Chinese through online courses for the Internet. Why? We can see that Chinese can be so popular that 1 billion people speak it. The Chinese language not merely creates joy for Chinese learners in studying but also brings a handy tool for businessmen and tourists on the world.