Seroconversion
n. [生][医]血清转化
🗣️ 情景例句
May I help you, sir?
需要我帮忙吗，先生？
Without method, little can be done to any good purpose.
不讲究方法，办事就没有成效。
This continental slope usually starts at a place somewhere near the 100-fathom mark
一般是从差不多100英寻水深的地方开始的，