principle of periodic allocation of costs

例句：

1. 1. The teacher explained theconcept of gravity to us in a simpleway.
   老师用简单的方式向我们解释了重力的概念。
2. 2. The company's success is basedon its strong brand image.
   公司的成功建立在强大的品牌形象上。
3. 3. The scientist discovered a newprinciple that could revolutionize medicine.
   科学家发现了一种新的原理，可以彻底改变医学。