Diacaustic
散焦面, 散焦曲线
🗣️ 情景例句
I'm an exchange student.
我是一名交换学生。
It's only a suggestion,and you can do what you please.
它仅仅是一个建议，你能做你喜欢的东西。
I don't want to imply that every point in this contract is negotiable.
不用我说，该合同中的每一条都要严格执行的，没有讨价还价的余地。