长达

• 拼音: cháng dá
• 汉字拆解: 长 = simplified 長 (long, to grow, pictograph of long hair); 达 = simplified 達 (to reach) = 辶 + 大 (phonetic)

含义

As long as; lasting; extending to. Used to emphasise that a duration or length reaches or exceeds a notably large quantity.

A degree phrase used before a measurement of time, distance, or physical length to emphasise that the quantity is impressively large. Always precedes the measurement (长达三年, lasting as long as three years; 长达数百公里, extending as far as several hundred kilometres). Used in both formal writing and speech. Not used for abstract, non-measurable qualities.

例句

1. 两国的外交谈判持续了长达三年，最终才就核心争议达成框架协议。
2. 这条输油管道绵延长达四千公里，横跨三个国家，是该地区最重要的能源通道。
3. 她在海外从事科研工作长达二十年，为国家培养了一批顶尖的生物医学人才。

用法指南

语境: journalism, reports, history, science, description

语气: emphatic

正确说法

• 这项工程的建设周期长达八年，耗资超过三百亿元。(The construction period for this project lasted as long as eight years and cost over thirty billion yuan.)
• 患者在确诊后接受了长达一年半的化疗，最终成功康复出院。(After diagnosis, the patient underwent chemotherapy lasting a full year and a half and was eventually discharged after a successful recovery.)

错误说法

• 他长达很高兴。(长达 must precede a specific measurable quantity — time, distance, or length; it cannot modify emotions or abstract states)

起源与历史

长 (long) + 达 (to reach, to attain). Together: reaching as far or as long as a specified measure.

文化背景

世代: All ages

社会背景: Universal