Umer
abbr. unit mass emission rates 单位质量发射率
🗣️ 情景例句
Thanks for your information and for being so helpful.
谢谢你的帮助和提供的讯息。
The lone sheep is in danger of the wolf.
孤独的羊难免遭狼的危险。
The things on show were all used a hundred years ago.
展出的都是100年前使用的东西。