1. Yin and yang are not fixed or still but active and changeable. 阴阳并不是固定的、静止的，而是活跃的、可改变的。
2. Middle school students in China usually have a fixed classroom . 中国的中学生通常在一个固定的教室上课。
3. When you hire a separate firm to do software development, most customers would prefer a fixed-price contract. 当你雇一个单独的公司来做软件开发，大多数客户更喜欢价格固定的合同。
英英解释
adj.
1. (of a number) having a fixed and unchanging value
2. fixed and unmoving
3. securely placed or fastened or set
4. incapable of being changed or moved or undone; e.g.
5. (of taxes) not increasing as the amount taxed increases
