Pdk
[医][=primary dog kidney]原代狗肾（细胞）
🗣️ 情景例句
These files are highly confidential, please store them properly.
这些文件是高度机密的，请妥善保存。
Learning is better than house and land.
学问是一生的财富。
First it made a circle to the right, then to the left.
令他吃惊的是，蜜蜂开始在蜂窝的表面表演一种舞蹈。