Ephemerida
n. [昆] 蜉蝣目（等于Ephemeroptera）
🗣️ 情景例句
This city is just too overpopulated.
这个城市人口太过稠密。
They teach you English in an intensive course lasting just a week.
他们用一周的时间教速成英语课程。
We can also use satellites to help us make telephone calls to foreign countries.
我们也能利用卫星帮助我们打国际电话。