译文
西城的杨柳逗留着春天的柔情，使我想起离别时的忧伤，眼泪很难收回。还记得当年你为我拴着归来的小舟。绿色的原野，红色的桥，是我们当时离别的情形。而如今你不在，只有水孤独地流着。
美好的青春不为少年时停留，离别的苦恨，何时才到头？飘飞的柳絮，落花满地的时候我登上楼台。即使江水都化作泪水，也流不尽，依然有愁苦在心头。

注释
⑴江城子：词牌名，又名“江神子”“村意远”。唐词单调，始见《花间集》韦庄词。宋人改为双调，七十字，上下片都是七句五平韵。
⑵弄春：谓在春日弄姿。明徐渭《赋得万绿枝头红一点》诗：“名园树树老啼莺，叶底孤花巧弄春。”
⑶离忧：离别的忧思；离人的忧伤。唐杜甫《长沙送李十一》诗：“李杜齐名真忝窃，朔云寒菊倍离忧。”
⑷多情：指钟情的人。宋张先《南乡子·京口》词：“春水一篙残照阔，遥遥，有个多情立画桥。”
⑸归舟：返航的船。南朝宋谢灵运《酬从弟惠连》诗：“梦寐伫归舟，释我吝与劳。”
⑹韶华：美好的时光。常指春光。唐戴叔伦《暮春感怀》诗：“东皇去后韶华尽，老圃寒香别有秋。”
⑺飞絮：飘飞的柳絮。北周庾信《杨柳歌》：“独忆飞絮鹅毛下，非复青丝马尾垂。”
⑻春江：春天的江。唐张若虚《春江花月夜》诗：“滟滟随波千万里，何处春江无月明。”▲

参考资料：

Jiangchengzi Song · Qin Guan Translated by Tonggui Wang

The willows of the West City are flirting spring gently,
which brought back my parting sorrow, I could not stop the tears.
I still remember that you tied my return boat lovingly,
the green fields, the red bridge and the parting scene that year,
And now, where are you？I can see only the river flowing.

Beautiful youth does not stay for the young people.
When is the end of the parting sorrow?
When catkins flew, flowers fell，I ascended the pavilion.
Even if the waters of the Spring River were all tears,
The flow of sadness would never end in my heart.▲