Pdk
[医][=primary dog kidney]原代狗肾（细胞）
🗣️ 情景例句
It's hard for some older people to take all that noise.
一些老年人没办法忍受那些噪音。
It's a piece of cake.
这很容易。
I'll teach you if you like.
要是你愿意学，我来教你。