P. p. d.
[医] 精制蛋白衍化物(结核菌素)
🗣️ 情景例句
Look before you leap.
想好了再行动。
I wish we had a baby.
我希望我们有个小宝宝。
If, as has been reported, they have protected humans from sharks,
正如报道中所说，如果海豚保护人不受鲨鱼侵害，