Perfluoroethylene
[机] 四氟乙烯
🗣️ 情景例句
That's all for now. How much do I owe you?
目前这些就够了，我要付你多少钱？
He is very hard to handle.
他很难应付。
Between twelve and eighty years we gradually lose this power;
除在12岁至80岁之间，我们逐渐丧失这种能力。