Graptolites
(graptolite 的复数) n.[古生]笔石( 古元脊椎动物, 现存化石 )
🗣️ 情景例句
What do you think of life in Beijing?
您觉得北京的生活怎么样？
We can't decide where to go.
我们不能决定去那里。
when a significant number of people are living permanently in space.
如果有相当数量的人永久性地住在太空，