单词alvarez-hypothesis
网络: 阿尔瓦兹假说
"So we are back to where we started with the Alvarez hypothesis, a single, large, (6-mile-wide) impact, " Johnson says.
所以我们即将回到阿尔瓦雷斯假说开始的地方，即为一颗六英里宽的大型撞击。