双语例句
The universe is expan- ding at a rate of 50 miles per second per million light years.
宇宙每1百万光年就以每秒50英里的速度在扩大
词典释义：
expan
时间: 2025-12-18 12:47:44
发展
词典释义：
发展
The universe is expan- ding at a rate of 50 miles per second per million light years.
宇宙每1百万光年就以每秒50英里的速度在扩大