Difluoride
二氟化物
🗣️ 情景例句
Speaking of school, how are your grades this term?
谈到学业，你这学期的成绩如何？
Imagination is more important than knowledge.
想像力比知识更重要。
I haven't forgotten anything, she said to herself. But then it was time to pay for them.
“我什么也没忘记，”她自言自语地说。但接着该是她付钱的时候了。