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A bridge is a structure built to span a physical obstacle (such as a body of water, valley, road, or rail) without blocking the way underneath. It is constructed for the purpose of providing passage over the obstacle, which is usually something that is otherwise difficult or impossible to cross. There are many different designs of bridges, each serving a particular purpose and applicable to different situations. Designs of bridges vary depending on factors such as the function of the bridge, the nature of the terrain where the bridge is constructed and anchored, and the material used to make it, and the funds available to build it. A tunnel is an underground passageway, dug through the surrounding soil/earth/rock and enclosed except for entrance and exit, commonly at each end. A pipeline is not a tunnel, though some recent tunnels have used immersed tube construction techniques rather than traditional tunnel boring methods. A tunnel may be for foot or vehicular road traffic, for rail traffic, or for a canal. The central portions of a rapid transit network are usually in the tunnel. Some tunnels are used as sewers or aqueducts to supply water for consumption or for hydroelectric stations. Utility tunnels are used for routing steam, chilled water, electrical power or telecommunication cables, as well as connecting buildings for convenient passage of people and equipment.

The Asia-Pacific Economic Cooperation it aimed to establish new markets for agricultural products and raw materials beyond Europe. Headquartered in Singapore, APEC is recognized as one of the highest-level multilateral blocs and oldest forums in the Asia-Pacific region and exerts a significant global influence. is an inter-governmental forum for 21 member economies in the Pacific Rim that promotes free trade throughout the Asia-Pacific region. The heads of government of all APEC members except Taiwan (which is represented by a ministerial-level official under the name Chinese Taipei as economic leader) attend an annual APEC Economic Leaders' Meeting. The location of the meeting rotates annually among the member economies, and a famous tradition, followed for most (but not all) summits, involves the attending leaders dressing in a national costume of the host country. APEC has three official observers: the Association of Southeast Asian Nations Secretariat, the Pacific Economic Cooperation Council and the Pacific Islands Forum Secretariat. APEC's Host Economy of the Year is considered to be invited in the first place for geographical representation to attend G20 meetings following G20 guidelines. countries in APEC - Australia, Brunei Darussalam, Canada, Chile, People's Republic of China, Hong Kong, China, Indonesia, Japan, Republic of Korea, Malaysia, Mexico, New Zealand, Papua New Guinea, Peru, Philippines, Russian Federation, Singapore, Chinese Taipei, Thailand, United States of America, Vietnam.