ratio to the primary unit

例句：

1. 1. The teacher gave thestudents a ratio of 2:3for their homework.
   老师给学生们分配了2:3的作业比例。
2. 2. The company's profit margin is calculated based onits sales and costs.
   公司的利润边际是基于其销售额和成本计算的。
3. 3. The ratioof sugar to water in this recipe is1:1.
   这个食谱中糖与水的比例是1:1。