Materia slba
[医] 白垢(牙)
🧩 词语组成解析
[医] 物质
🗣️ 情景例句
I saw a real shark.
我看到一条真正的鲨鱼。
Send a postcard to me when you arrive in Shanghai.
你到上海以后给我发张明信片。
'Oh dear,' said the conductor suddenly.
“哎呀，”售票员突然说，