Pdk
[医][=primary dog kidney]原代狗肾（细胞）
🗣️ 情景例句
Thank you for everything.
一切谢谢你。
I only regret that I have but one life to give for my country.
我抱憾的是，只有一次生命能献给祖国。
It sped downhill at the end of the race and its driver had a lot of trouble trying to stop it.
它在接近终点时，冲下了山坡，驾驶员费了好大劲才把车停下来。