Schweizerite
叶蛇蚊石
🗣️ 情景例句
We had a cat when I was eight years old.
我八岁时养过一只猫。
I did Math this morning.
我今天早上做算术。
Ethanol is more effective at a concentration of 50-70 percent;
乙醇的浓度为50％至70％时比较有效，