informal mathhematics的用法和樣例：
例句
- This is an informal introduction to some interactions between mathematics and physics, entered around the generalizations of derivatives.
這是一篇關於數學和物理中以導數的推廣為中心交流的非正式介紹文章。 - Though many parents are uncomfortable with math themselves, experts say informal lessons can be incorporated into everyday activities, such as cooking and driving.
雖然許多家長自己對數學也不大擅長，但專家說，非正式的課程可以融入每日的活動里，像是烹飪或是開車。
