求教 og 12 sc 8

flow123flow · 发表于 2011-10-21 16:40:17

the widely accepted big bang theory holds that the universe began in an explosive instant ten to twenty billion years ago and has been expanding ever since.

请问 ten to twenty billion years ago 是什么意思？关键是这个to 不太清楚。谢谢！

cxroger · 发表于 2012-11-4 23:26:19

100 至 200 亿年

求教 og 12 sc 8

所属分类: 下线版块

正在浏览此版块的会员 ()