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Some harmful substances combine with water vapor and become more toxic, such as sulfuric acid or subsulphide, hydrolysis of chlorine to hydrogen chloride or hypochloric acid, and fluoride hydrolysis to hydrogen fluoride. As a result, air pollution in haze days is much more serious than usual. In addition, it is also easy to induce cardiovascular disease. Overseas tourism, also known as travel abroad, refers to travel with passports to other countries or regions, including border Tours, Hong Kong and Macao Tours and international Tours. Traveling to a different area, the travel documents are also different. Referred to in the present to travel abroad, especially for Chinese citizens to travel abroad at one's own expenses, which is organized by China's tourism enterprises of Chinese citizens to travel abroad in the form of the team at its own cost, including visiting relatives, visiting friends abroad and other short-term private matters. In view of the national conditions of China as a developing country, the national tourism administration and the ministry of public security jointly issued the measures on the administration of tourism administration of Chinese citizens, referring to the general practice in the world. The guiding principle of "planning, organized and controlled development" is adopted for the establishment of citizens' self-funded travel abroad Unibind Equipment: The XU Line of Unibind Binding Machines provide you with the versatility you will need. Choose from three the latest models of: The XU-138 for low-volume, the XU-238 for mid-volume use along with the XU-338 for high-volume use. These Binding Systems let you edit your books without wasting a binding mechanism. Simply re-heat your bound book, replace any sheets necessary, and then move it for the cooling rack to finish the bind. The Unbind Binding Machines are extremely easy to use: All you do is put your printed sheets in a Unibind Cover and set the duvet for the heating rack. The machine automatically activates plus an indicator light will turn green in about 90 seconds if the document is ready to be moved towards the cooling rack