Tetrafluoroethylene
四氟乙烯
??? 情景例句
I always wanted to travel to Europe but I was afraid that language would be a problem.
我總想去歐洲旅游，但我又怕語言是個問題。
I'm going to send him a new one.
我正要送給他一個新的。
Good. thank you for the order.
好的，謝謝你的訂貨。