Karidium
氟化钠
🗣️ 情景例句
My mother, Ellen Stewart.
我母亲Ellen Stewart。
How did you get there?
你怎么去的？
I once spend an uncomfortable weekend which I shall never forget at his house.
有一次，我在他家里度周末，过得很不愉快。这事我永远不会忘记。