Cytidine
[机] 胞
🗣️ 情景例句
Speaking of school, how are your grades this term?
谈到学业，你这学期的成绩如何？
Christmas comes but once a year.
佳节良辰，机会难得。
What will be the population of these countries by the end of the twentieth century?
到20世界末较发达国家的人口将是多少？