Space, once the arena of great power rivalry, now depends on international co-operation for its costly endeavor. The aerospace industry represents the economic, military and technological level of a country, and is also an important symbol of a country’s comprehensive national strength and national defense strength. Of course, the development of the aerospace industry requires […]
It is well known that ultraviolet light directly affects human health and is one of the factors contributing to aging skin and even skin cancer. More than 53 percent of the country’s skin cancers are found on the left side of the body, according to a study of skin cancer in the United States. The […]
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