Mendel reaction
[医] 孟德尔氏反应(结核菌素皮内试验)
🧩 词语组成解析
n. 孟德尔（奥地利遗传学家）
🗣️ 情景例句
How many stamps do I need?
我需要多少邮票？
While you were writing letters,I was reading a book.
当你正在写信时，我正在读一本书。
I often fish for hours without catching anything.
我经常一钓数小时却一无所获，