zero reading

例句：

1. 1. The zero reading of the thermometer is 25 degrees Celsius.
   温度计的零读数是25摄氏度。
2. 2. The zero reading of the balance is zero.
   天平的零读数为零。
3. 3. The zero reading of the scale is 1 kilogram.
   秤的零读数是1公斤。