So some graduate student sits there and counts 50,000 annual layers.

某个研究生坐在那里，数了 5 万层。

Some ice cores have annual layers just like trees do, you know, how you can count tree rings?

有些冰核有一年生的层，就像树一样，你知道，你是怎么数年轮的？

So what we're in, this is just one layer, one annual layer. This is this year's snowfall.

所以我们所处的，这只是一层，一个年度层。这是今年的降雪。