Phthanite
燧石, 角石, 英石岩
🗣️ 情景例句
I visited Japan on an observation tour of its industries.
我到日本观摩它的工业。
We used to go to the movies about once a week.
我们过去常一个星期大约去看一次电影。
and as the number of stars in the universe is so vast,
因为宇宙中恒星的数目极其庞大，