Fluorination
n. 氟化作用
🗣️ 情景例句
He's the publisher of the Carlson Publishing Company.
他是Carlson出版公司的老板 。
A ready way to lose friend is to lend him money.
失友都因借钱起。
Now move the hand to and fro and around but not up and down.
然后把手前后左右以及旋转摆动，但不要上下摆动。