源头

He pursued the river to its source.

他沿着河流走到它的源头。

Fame like a river is narrowest at its source and broadest afar off.

名誉如江河,源头最狭窄,远处最宽阔。

Unless controlled the quality of musical file from fountainhead, otherwise inextricability.

除非从源头上控制了音乐文件的质量，否则无法解决。

Is the water polluted at source?

河水在源头受到污染的吗?

That is putatively the source of variation of spot patterns from leopard to leopard and of orientation map patterns from person to person.

这可能不同花豹有著不同斑点，或不同人有著不同指向图谱的变异源头。