Seropositivity
血清阳性
🗣️ 情景例句
Hi, Peter.
彼得，你好。
Just to be on the safe side.
为安全起见。
they would devour all our crops and kill our flocks and herds, if it were not for the protection we get from insect-eating animals.
昆虫会吞食我们的全部庄稼，杀死我们的成群的牛羊。