Periodontium
n. [解]牙周组织(尤指牙周膜)
🔁 扩展释义
【医】 牙周组织, 牙槽骨膜
🗣️ 情景例句
There's no doubt about that.
此事确定无疑。
All this time Dick has only thought of his own future.
近些时来，迪克老是在思考自己的将来。
Much to the aristocrat's amusement,
贵族感到非常好笑的是