Phthanite
燧石, 角石, 英石岩
🗣️ 情景例句
You really ought to take some time off.
的确应该休一休假。
What is the total circulation of this newsletter.
这份新闻通讯总发行量多少？
We're going to meet here, outside the school gate, at two o'clock.
我们打算两点钟在校门外见面。