decimal rheostat

例句：

1. 1. The price is 50 cents for a pack of 20 candies.
   一包20块糖果的价格是50美分。
2. 2.The teacher asked the students to divide the work into decimal parts.
   老师要求学生们将工作分成十进制部分。
3. 3.The calculator has a decimal keypad for easy multiplication and division.
   计算器有一个十进制键盘，用于轻松进行乘法和除法。