Umer
abbr. unit mass emission rates 單位質(zhì)量發(fā)射率
??? 情景例句
Trevor wants to go to Japan so there's going to be trouble whild he's gone.
特里瓦要去日本，所以他不在的時(shí)候就麻煩了。
By the time we got there,the play had already begun.
等我們到那里，戲已經(jīng)開始了。
Thanks, I'd like that.
謝謝，我非常樂意。