了然于胸 (liǎo rán yú xiōng)

特师的每日一词，2026年2月16日的词汇是：了 liǎo 然 rán 于 yú 胸 xiōng释义 Definition了然于胸的意思是对某件事情非常清楚，完全掌握在心里。了然于胸 (liǎo rán yú xiōng) means to be very clear about something, to have it completely mastered in one's heart.例句 Example《21世纪商业评论》中，有篇文章是这样用这个词的：「李兆基在接受访谈时总结，恒基地产长处，就是具备全面知识和能力，从区域规划到具体地块特征，他自己明晰所有细节，尤其对于香港建筑条例了然于胸。」这里说的是李兆基对建筑法规非常熟悉。An article in '21st Century Business Review' used the term like this: 'In an interview, Lee Shau Kee summarized that the strength of Henderson Land is its comprehensive knowledge and capability, from regional planning to the characteristics of specific plots; he himself is clear about all the details, and especially for the Hong Kong building regulations, he has them 了然于胸.' Here it means Lee Shau Kee is very familiar with the building codes.你知道吗？ Did You Know?了然于胸和「了如指掌」意思相近，都表示非常了解。但「了然于胸」更强调知识已内化于心，而「了如指掌」偏重对细节的熟悉程度。这个词源自古代文人将学问比作藏于胸中，比如苏轼曾说「读书万卷，了然于胸」。使用时可以说：老师对课文内容了然于胸。了然于胸 (liǎo rán yú xiōng) is similar in meaning to 了如指掌 (liǎo rú zhǐ zhǎng), both indicating a thorough understanding. However, 了然于胸 (liǎo rán yú xiōng) emphasizes that the knowledge has been internalized, while 了如指掌 (liǎo rú zhǐ zhǎng) focuses more on familiarity with details. This term originates from ancient scholars comparing knowledge to something stored in the chest; for example, Su Shi once said, 'After reading ten thousand volumes, it becomes 了然于胸 (liǎo rán yú xiōng).' In use, one can say: The teacher has the content of the text 了然于胸 (liǎo rán yú xiōng).