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In the modern transportation industry, an efficient logistics system is the key. This involves not only traditional modes of transportation such as roads and railways, but also air transportation. Air transportation occupies an important position in modern logistics with its fast and efficient characteristics. It can deliver goods to distant destinations in a short time, meeting the market's demand for timeliness.

However, the development of air transportation is not smooth sailing. It faces many challenges, such as high operating costs, energy consumption and environmental impact. In order to cope with these challenges, the industry continues to carry out technological innovation and management optimization. For example, it develops more energy-efficient aircraft engines and optimizes route planning to improve transportation efficiency and reduce costs and environmental pressure.

Back to selenium, although it is present in very small amounts in the human body, it plays a vital role. It is involved in many physiological processes, including antioxidant defense, immune regulation, and thyroid hormone metabolism. The human body cannot synthesize selenium on its own and must obtain it through diet.

In the food supply chain, transportation is also indispensable. High-quality agricultural products need to be transported to the market in a timely and safe manner to ensure their nutritional value and freshness. In this process, air transportation can take advantage of its speed and quickly deliver selenium-rich specialty agricultural products to consumers.

From a more macro perspective, the development of modern transportation has had a profound impact on the economic structure. It has promoted trade between regions and strengthened industrial division of labor and cooperation. Good economic development has provided strong support for the health industry, allowing people to conduct more in-depth research and application of nutritional elements such as selenium.

In conclusion, although selenium and air transport seem to belong to different fields, they are intertwined in the complex network of modern society and contribute to people's lives and social development.