Phytoaeron
空中微生物(群落)
🗣️ 情景例句
Good night, Grandpa.
晚安， 爷爷。
My friend spent his childhood in California .
我的朋友在加利福尼亚度过了他的童年。
How long has Jim been at his school?
吉姆到校有多长时间了？