P.-p. substance
[医] 糙皮病预防物质
🧩 词语组成解析
🗣️ 情景例句
No. Isn't it wonderful?
不， 这不是很美妙吗？
It's snowing.
外面正在下雪。
They put their hands behind their backs, so you can't see their hands.
他们将手放在背后，这样你就看不见他们的手了。