adv
for a long time; a long time ago; long ago; long since (syn.) 早著, 晨早, 早着, 久已, 早已, 早就, 一早
他對那位漂亮的女孩暗戀已久。
他对那位漂亮的女孩暗恋已久。
tā duì nà wèi piào liàng de nǚ hái àn liàn yǐ jiǔ ． He had long had a crush on the pretty young woman.
Examples (Tatoeba—Mandarin-English)
Mandarin
找到了寻找已久的珍本。
找到了尋找已久的珍本。
zhǎo dào le xún zhǎo yǐ jiǔ de zhēn běn 。
I found a rare book I had been looking for.
I found the rare edition that I've been looking so long for.
Examples (粵典–words.hk)
Cantonese
农历新年派利是系一个由来已久嘅习俗。
農曆新年派利是係一個由來已久嘅習俗。
Giving out red packets has been a custom at Lunar New Year for a long time.
Examples (Wiktionary)
Mandarin
他对那位漂亮的女孩暗恋已久。
他對那位漂亮的女孩暗戀已久。
tā duì nà wèi piào liàng de nǚ hái àn liàn yǐ jiǔ ．
He had long had a crush on the pretty young woman.
Mandarin
持续两年多的矿潮结束，沉寂已久的垃圾佬们终于又活跃了起来。
持續兩年多的礦潮結束，沉寂已久的垃圾佬們終於又活躍了起來。
chí xù liǎng nián duō de kuàng cháo jié shù ， chén jì yǐ jiǔ de lā jī lǎo men zhōng yú yòu huó yuè le qǐ lái ．
With the end of the crypto mining craze that lasted for over two years, the "garbage collectors" have finally gone back to action after a long period of silence.
Mandarin
后来，金正日总书记太突然地、太早地不幸逝世后，张成泽开始全面著手实现蓄谋已久的政治野心。
後來，金正日總書記太突然地、太早地不幸逝世後，張成澤開始全面著手實現蓄謀已久的政治野心。
hòu lái ， jīn zhèng rì zǒng shū jì tài tū rán de ， tài zǎo de bù xìng shì shì hòu ， zhāng chéng zé kāi shǐ quán miàn zhuó shǒu shí xiàn xù móu yǐ jiǔ de zhèng zhì yě xīn ．
When Kim Jong Il passed away so suddenly and untimely to our sorrow, Jang began working in real earnest to realize his long-cherished greed for power.