Umer
abbr. unit mass emission rates 单位质量发射率
🗣️ 情景例句
May I have a tour of the cockpit, please?
我能参观一下驾驶舱吗？
He's not in. May I take a message for him?
他不在，我能替他捎个口信吗？
He made only six films between 1940 and 1966 and only the first of these is still popular today.
1940年至1966年，他仅制作了6部电影，其中只有第一部至今仍然受到欢迎。