Odontolith
[医] 牙垢, 牙积石
🗣️ 情景例句
Next weekend ...
下周末……
The surest way to be happy is to be busy.
要快乐，最可靠的办法是忙碌。
One wants to meet like-minded collectors, to get advice, to compare notes, to exchange articles, to show off the latest find.
收藏者要会见情趣相投的收藏者，以获取教益，交流经验、交换收藏品，炫耀自己的最新收藏。