Umer
abbr. unit mass emission rates 单位质量发射率
🗣️ 情景例句
I read everything I can get my hands on but I like ghosts stories best.
我随意拿起什么便看什么，但我最喜欢看鬼故事。
Learn to say before you sing.
按部就班。
On the left.
站在左边。