P. p. d.
[医] 精制蛋白衍化物(结核菌素)
🗣️ 情景例句
Do I have to remind you yet again?
还需要我再次提醒你吗？
Could you tell me my reservation number, please?
请你告诉我我的预订号码好吗？
I seldom have any difficulties.
我很少碰到困难。