Ulva
n. [植]石莼
🗣️ 情景例句
Nope. I am in perfect health.
没有。我身体好的很。
My brother is two years younger than I am.
我的兄弟比我年轻2年。
Alternatively, if the star were small, the life-supporting planet would have to have a close orbit round it and also provide the perfect conditions for life forms to develop.
反之，如果恒星很小，维持生命的行星就要在离恒星很近的轨道上运行，而且要有极好的条件才能使生命得以发展，