Umer
abbr. unit mass emission rates 单位质量发射率
🗣️ 情景例句
You're Arnold Franklin!
你是Arnold Franklin！
Happy landing.
祝您早安 注：是送行者向上飞机的人说的告别语。
but more often than not, the greater part of the journey is spent on roads with few service stations and too much traffic.
但旅行的大部分时间都花在路上，而且只有很少的服务设施，交通也很拥挤。