Keywords: 书面语, shūmiànyǔ, written Chinese, formal Chinese, literary Chinese, 口语, kǒuyǔ, spoken Chinese, Chinese writing, formal vs informal Chinese, academic Chinese, official language.
Summary: 书面语 (shūmiànyǔ) refers to the formal, written style of the Chinese language, distinct from the casual, spoken style known as 口语 (kǒuyǔ). Used in academic papers, official documents, literature, and formal speeches, it employs more complex grammar and a specific, often more classical, vocabulary. Understanding the difference between 书面语 and 口语 is a crucial step for any intermediate learner wanting to master the different registers of Chinese and communicate effectively in various social and professional contexts.