Ppmv
abbr. parts per million by volume 百万分体积比
🗣️ 情景例句
How long?
多久？
What's eating you?
怎么搞的？
Shivering in their wet clothes, the teenagers looked on while three men dived repeatedly into the water to locate the dish.
那些孩子们穿着湿衣服哆嗦，看着3个工人轮潜入水中以确定盘子的位置。