Resitol
[化] 乙階段酚醛樹脂
??? 情景例句
Richard, did you go to the aerobics class, really? Richard
你真的上了有氧運動課嗎？
It is my pleasure to introduce the keynote speaker for today.
我很榮幸地介紹今天的主講人。
Mary and lizzy are organizing a large medical conference.
瑪麗和莉齊正在組織一個大型的醫學會議。