The article discusses how certain words in Chinese sentences can show different types of emphasis. They found that when words like 'Shi' and 'Zhi' are used together, it creates a special kind of emphasis called 'Double Focus Sentence'. The researchers identified three main types of emphasis: Contrastive focus, Topical focus, and Identificational focus. They discovered that 'Shi' and 'Zhi' usually emphasize differences, 'Lian' focuses on topics, and 'Shi…de' helps identify things clearly.