Seroconversion
n. [生][医]血清转化
🗣️ 情景例句
I doubt it, sir. We'll try, but I can't promise anybody before 3:30.
我没把握，先生。我们会尽早的，但我不敢许诺3：30以前行。
I have great difficulty in understanding him.
我觉得很难理解他。
What do people eat in England?
在英格兰，人们吃什么？