The one you love is far away, just as the Book of Songs puts it: 'on the other side of the water'.
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history
From 《蒹葭》 in the Airs of Qin of the 诗经: 所谓伊人,在水一方, 'the one I long for is on the other side of the water'. The singer follows the river upstream and down, and the loved one always stays out of reach.
culture
琼瑶 took the line as the title of her 1975 novel, and the song of the same name, with her words, became famous in 邓丽君's recording.