Polycythaemia
[医]红细胞增多症
🗣️ 情景例句
Keep smiling! things will calm down.
乐观一点，事情会平息下来的。
Sickness is everyman's master.
英雄只怕病来磨。
Since that time, various types of hovercraft have appeared and taken up regular service.
从那以后，各种各样的气垫船出现了，并开始了定期航行服务。