The Chinese word "夏日" (xiàrì) is a compound noun formed through semantic combination, where the first character "夏" means "summer" and the second character "日" means "day" or "sun". It follows the common structural pattern in Chinese of a modifying element ("夏") placed before a core noun ("日"), literally creating the meaning "summer day" or "summer sun", and by extension evokes the entire season's characteristic weather and feeling. This method of directly combining two independent, meaningful characters to create a new, specific concept is a fundamental and productive way of forming words in the language.