Umer
abbr. unit mass emission rates 单位质量发射率
🗣️ 情景例句
OK. Let me repeat it.
好吧。让我重复一遍。
He is truly happy who makes others happy.
真正幸福的是使人幸福的人。
Babies of two months old do not appear to be reluctant to enter the water.
两个月的婴儿并未显得不愿意入水。