The Chinese word "大厅" is formed through the semantic combination of two characters: "大", which means "big" or "large", and "厅", which means "hall" or "room". When these characters are joined, "大" acts as a descriptive modifier for "厅", directly conveying the concept of a "large hall" or "main room". This process exemplifies how Chinese often creates compound words by integrating meaningful components to produce a clear, unified idea.