Diacaustic
散焦面, 散焦曲线
🗣️ 情景例句
He'll be fine, Marilyn.
他不会有事的 ，Marilyn。
Can I have a second-class one way ticket to Chicago,please?
请给我一张去芝加哥的单程二等票好吗？
She also likes them to borrow the books. But she is very strict.
她也喜欢他们来借书。但她对大家非常严格。