纪录片《火星任务》 第39期 没有生命迹象（在线收听）

It had always been thought

过去人们认为

that this strange red colour

这种奇怪的红色

was a result of pollution,

是污染造成的

that the water had been tainted by iron

罗马时期上游开凿了矿井

and other metals washed downstream from the mines

人们以为矿井中的铁和其他金属

that have existed here since Roman times.

污染了河水

Well, I can't see anything obviously alive,

我看不到任何明显的活物

and there's clearly no fish swimming around in here.

显然没有鱼在这里面游来游去

There are no visible signs of life.

没有明显的生命迹象

And the Rio Tinto's waters hold another secret,

力拓河水还有另一个秘密

which made people think there was no hope

这个秘密让人们认为

of even the tiniest life forms ever existing here.

最微小的生命也无法在这里存活

So, I've got a pH meter here,

这是一个酸碱度检测仪

and I'm going to test the acidity

我要测量一下

of the water in the Rio Tinto at this place here.

这里力拓河水的酸碱度

Now, a normal river, a healthy river,

一条普通 健康的河

would be pH7 - that's neutral.

河水的pH值是7 呈中性

And, obviously, the lower the number,

显然 数字越小

the greater the acidity is.

酸性越强