Methide
甲基化物
🗣️ 情景例句
It's a surprise.
会给你一个惊喜。
He has a pound of beef.
他有一磅牛肉。
The Hubble telescope was launched into space by NASA on April 20,1990 at a cost of over a billion dollars.
哈勃望远镜于1990年4月20日由国家航空航天局发射升空，耗资10多亿美元。