Umer
abbr. unit mass emission rates 单位质量发射率
🗣️ 情景例句
C'est la vie.
生活就是如此。
he has a fresh approach.
他有一个新的处理办法。
The situation seemed hopeless and he knew his life was in danger.
这种情况看来是毫无希望了，他知道他有生命危险。