溯源的英文：
trace to the source

参考例句：

To trace up the source and inquire into the origin
溯源而上

To trace a stream to its source
因流溯源

trace是什么意思：
n. 痕迹；踪迹；微量；迹线
v. 追溯；回溯；跟踪，追踪；描绘；探索；沿路走

trace contaminant
残余污染物

They are trying to trace the source of the trouble.
他们正设法找出这件麻烦事的起因。

They disappeared without leaving a trace.
他们不见了，没有留下一点痕迹。

TOU (Trace Operate Unit)
追踪装置|故障探测装置

We traced the footsteps in the snow.
我们跟踪雪地上的足迹。

source是什么意思：
n. 来源，出处；原始资料；原因；发源地

They are trying to trace the source of the trouble.
他们正设法找出这件麻烦事的起因。

Where is the source of the Nile?
尼罗河发源于何处？

Is the water polluted at source?
河水是在源头受到污染的吗？

We understand that sourcing is not static.
我们明白采购不是一成不变的。

Religion is not the only source of division.
宗教问题并不是分裂的唯一来源。