P.-p. substance
[医] 糙皮病预防物质
🧩 词语组成解析
🗣️ 情景例句
That's nothing at all.
不用客气。
All products have to pass strict inspection before they go out.
所有产品出厂前必须要经过严格检查。
Thank you all for coming.
谢谢光临。