Lapis dentalis
[醫] 牙垢, 牙石
?? 詞語組成解析
[醫] 石
??? 情景例句
Catch you later.
以后再聊。
Today English is the international language of business and trade.
如今英語是商務和貿易的國際性語言。
In the evenings he studied hard for his exams, and most mornings he took tourists around Oxford.
他晚間努力學習，以應付考試，而大多數早上，他則帶領游客在牛津大學參觀。