cost sales

例句：

1. 1. The cost of the new car is $30,000.
   这辆新车的价格是3万美元。
2. 2. It's important to consider the cost of living when making a purchase.
   在购买时考虑生活成本是很重要的。
3. 3. The company spent millions on research and development.
   这家公司在研究和开发上花费了数百万美元。