Rav
abbr. 瑞星杀毒软件；右心房容积（Right Atrial Volume）
🗣️ 情景例句
That isn't necessary.
这倒不必。
What's done by night appears by day.
若要人不知，除非己莫为。
Tickets, please! Tickets, please!
请出示车票！请出示车票！