voltage pen pointer

例句：

1. 1. The voltage of the power line is 220 volts.
   电线的电压是220伏特。
2. 2. The voltage regulator controls the flow of electricity.
   电压调节器控制电流流动。
3. 3. Voltage is a measure of the strength of an electric current.
   电压是电流强度的度量。
4. 1.She wrote her name in the notebook with a pen.
   她用笔在笔记本上写下了自己的名字。
5. 2. He used a pen to draw a picture on the wall.
   他用笔在墙上画了一幅画。
6. 3.The pen was too small for writing, so she had to use a pencil.
   这支笔太小，不适合写字，所以她不得不用铅笔。
7. 1. The pointer on the clock points to the hour.
   时钟上的指针指向了小时。
8. 2. The pointer on the map indicates the direction to the next town.
   地图上的指针指示了前往下一个城镇的方向。
9. 3. The pointer on the thermometer shows the temperature.
   温度计上的指针显示了温度。