Seroconversions
(seroconversion 的复数) n.[生][医]血清转化
🗣️ 情景例句
We have around 3,000 workers.
大约有3000名职工。
How much is it by registered mail?
挂号信要多少钱？
later, we shall undergo a progressive loss of our vigour and resistance which, though imperceptible at first,
再迟一些，我们就要经历生命力和抵抗力逐步衰退的过程。虽然这个过程起初难以觉察，