Heptavalent
a. 七价的
🗣️ 情景例句
What's Harry doing tonight?
Harry，今晚做什么？
There is nothing either good or bad, but thinking makes it so.
事情本无好与坏，全在自己怎么想。
In 1892 the age of mass arrivals began, during which 15 million new people passed through Ellis Island into the USA over a period of 62 years.
1892年开始了一个国外移民大量涌入的年代，在随后的62年中，有1，500万新来的人通过埃利斯岛进入美国。