做了个费米悖论的树状图,你倾向哪种

cat cola-avatar

cat cola

2020-10-06T03:56:19+00:00

[img]https://img.nga.178.com/attachments/mon_202010/14/ekQ5-gq7rKyT3cSsg-bj.jpg.medium.jpg[/img]
还有人有别的思路吗,分支或节点[s:ac:羞]以符合现实世界为前提