罗德里格斯马丁博士忍痛将它放倒,并分别从离喷发点400米及16千米处砍倒两棵与其树龄相同的松树进行比较。
One unpleasant element often ejected in volcanic eruptions is mercury.
火山喷发时经常会喷射出一种不怎么好的元素-汞。
That was certainly the case in 1949, as soil-sampling showed.
正如土壤采样所示,1949年的火山喷发确实释放出了汞元素。
The question was, how much of it had got into the trees
但问题是,有多少进入了树体中?
Mercury falling
脱落的汞
When he analysed the survivor s scar tissue Dr Rodriguez Martin found high levels of themetal in it:
当罗德里格斯马丁博士分析了这棵幸存的树上的疤痕组织后,他发现其中的汞元素含量很高:
more than 22 micrograms per kilogram of wood.
每公斤木材中超过22毫克。
That was not surprising, given that this tissue would have formed soon after the eruption.
这并不出人意料,因为该组织是在火山喷发不久后形成的。
What was surprising was that the wood of the survivor tree s rings had only 2.3 microgramsof mercury per kilogram in it.
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