Usage note
悠久形容时间很长,很久以前就存在。比如悠久的历史、悠久的文化。
Yōu jiǔ xíng róng shí jiān hěn cháng, hěn jiǔ yǐ qián jiù cún zài. Bǐ rú yōu jiǔ de lì shǐ, yōu jiǔ de wén huà.
Long-standing describes something that has existed for a very long time, such as a long history or long-standing culture.