logarithmic circuit

例句：

1. 1. The formula for calculating the area of a circle is logarithmic.
   计算圆面积的公式是对数。
2. 2.The logarithmic function is used to calculate the exponent in exponential equations.
   对数函数用于计算指数方程中的指数。
3. 3. The logarithmic scale on the graph shows the concentration of bacteria at different depths.
   图中的对数刻度显示了不同深度细菌的浓度。