P. p. d.
[医] 精制蛋白衍化物(结核菌素)
🗣️ 情景例句
Nice to meet you.
很高兴见到你。
I bought the car on Paul's recommendation.
根据保罗的推荐我买了这辆车。
if successful, to larger audiences.
如果讲得好，可能向更多人发表演说。