translation.en: And again, it forms the same straight line. You have a little bit of thickening in the line because people do have disagreements, what the key points are, there's differences of opinion when agriculture started, or how long the Cambrian Explosion took.
translation.zh: 再次，它形成相同的直线。 因为人们有不同的意见，关于什么是要点 人们对农业什么时候开始的有着不同的意见， 或者什么时候 -- 寒武纪大爆发用了多长时间。