A song in vain
In Chinese, Pinyin is x í NGW ǎ ngy ǐ ngq ū, which means that whatever the reason is, what the result will be. From Liezi Shuo Fu.
Idiom usage
As a predicate or attributive; of cause and effect
Analysis of Idioms
Antonym: shape straight shadow positive
The origin of Idioms
Liezi Shuo Fu: "if the form is wrong, it will affect the music; if the form is straight, it will affect the right."
Idiom explanation
When the shape of a thing is crooked, its shadow is crooked. Metaphor has what reason will have what result.
A song in vain
focus on only one aspect and neglect all the others - jǔ yī fèi bǎi