Serorelapse
[医] 血清效价回升
🗣️ 情景例句
The number's no longer in service.
这个号码现在是空号。
What are you doing?
你正在做什么？
There are four seasons in the year here--spring, summer, autumn and winter.
这儿一年有四季--春、夏、秋、冬。