Ppmv
abbr. parts per million by volume 百万分体积比
🗣️ 情景例句
A guarantor is responsible for the loan
担保人要对贷款负责
The news caused great excitement.
这消息令人极为兴奋。
When a student recently saw two workmen using a pneumatic drill outside his university, he immediately telephoned the police and informed them that two students dressed up as workmen were tearing up the road with a pneumatic drill.
最近有个学生看见两个工人在学校门外用风钻干活，马上打电话报告警察，说有两个学生装扮成工人，正在用风钻破坏路面。