P. p. d.
[医] 精制蛋白衍化物(结核菌素)
🗣️ 情景例句
Ellen, where's the cinnamon? Ellen
肉桂放在哪？
We can't draw well.
我们不能画那么多。
Sometimes, my grandma decides to buy one big birthday present for both of us.
有时，奶奶决定给我俩就买一件大生日礼物。