Youbian dubian (simplified Chinese: 有边读边; traditional Chinese: 有邊讀邊; pinyin: yǒu biān dú biān; lit. 'read the side if any'), or dubanbian (读半边; 讀半邊; dú bàn biān; 'read the half'), is a rule of thumb people use to pronounce a Chinese character when they do not know its exact pronunciation. A longer version is '有邊讀邊，沒邊讀中間' (yǒu biān dú biān, méi biān dú zhōngjiān; lit. "read the side if any; read the middle part if there is no side").[1]
Around 90% of Chinese characters are phono-semantic compounds that consist of two parts: a semantic part (often the radical) that suggests a general meaning (e.g. the part 貝 [shell] usually indicates that a character concerns commerce, as people used shells as currency in ancient times), and a phonetic part which shows how the character is or was pronounced (e.g. the part 皇 (pinyin: huáng) usually indicates that a character is pronounced huáng in Mandarin Chinese).
The phonetic part represents the exact or almost-exact pronunciation of the character when the character was first created; characters sharing the same phonetic part had identical or similar readings. Linguists rely heavily on this fact to reconstruct the sounds of ancient Chinese. However, over time, the reading of a character may be no longer the one indicated by the phonetic part due to sound change and general vagueness.[2]
When one encounters such a two-part character and does not know its exact pronunciation, one may take one of the parts as the phonetic indicator. For example, reading 詣 (pinyin: yì) as zhǐ because its "side" 旨 is pronounced as such. Some of this kind of "folk reading" have become acceptable over time – listed in dictionaries as alternative pronunciations, or simply become the common reading. For example, people read the character 町 ting in 西門町 (Ximending) as if it were 丁 ding. It has been called a "phenomenon of analogy", and is observed in as early as the Song dynasty.[3]
人是很擅長聯想的把一個字放在句子中間聯繫上下文認識的傳承字全靠腦補就能猜出這個意思就像我們遇到一個不認識的字有邊讀邊，沒邊讀中間基本能猜個八九不離十