Umer
abbr. unit mass emission rates 单位质量发射率
🗣️ 情景例句
I'm sorry, I can't help you. I'm just a tourist also.
很抱歉，我帮不了你，我也只是个游客。
I meet the boy whose aunt is a model.
我遇到那个男孩的姑妈是模特。
Certainly!said her mother.
“当然可以！”她妈妈说。