capacity volume variance

例句：

1. 1. The new machine has a capacity of 500 units.
   这台新机器的容量是500个单位。
2. 2. The battery has a capacity of 1000 mAh.
   电池的容量是1000毫安时。
3. 3. The tank has a capacity of 20 liters.
   这个水箱的容量是20升。
4. 1. The book has a volume of 100 pages.
   这本书有100页。
5. 2. The speaker's voice has a volume of about 80 decibels.
   演讲者的嗓音大约在80分贝左右。
6. 3. The music box has a volume of 10 decibels.
   这个音乐盒的音量是10分贝。