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The Chinese conjunctive adverb 便 (biàn) is used to indicate a direct consequence or immediate result following a specific action or event. It often conveys a sense of immediacy or a natural progression from one action to another.
In the sentence "他一下课便回家了" (Tā yī xià kè biàn huí jiā le), the use of 便 emphasizes that as soon as he finished class, he immediately went home. Similarly, in "他一毕业便决定回国" (Tā yī bì yè biàn juédìng huí guó), it indicates that right after graduating, he made the decision to return to his home country.
The structure typically involves a time phrase or condition followed by 便, leading to the result or action that occurs as a consequence. This adverb is often used in formal contexts and can enhance the fluency and coherence of sentences by clearly linking actions in a cause-and-effect relationship.