Phorphyrosiphon
紫管藻属
🗣️ 情景例句
and I've completely forgotten about all my business problems.
但我已经彻底抛开了我所有的业务上的问题。
Children enter school at the age of five,don't they?
孩子们在5岁时入学吗？
So the number of stars that we know exist is now estimated at about 300 million million million.
因此，我们所知道的现有恒星数目估计约有30亿×1000亿颗。