Polyyne
聚炔烃
🗣️ 情景例句
78 percent of black high-school graduates are unemployed.
百分之四十八的黑人高中毕业生失业。
Are they all non-reserved seats?
他们全部不预订的吗？
I didn't know he was the richest person in the world.
我不知道他是世界上最有钱的人。