We started to use a swappable battery technology.

我们开始使用可更换电池技术。

And so by the 1920s, these plug boards were made swappable.

因此，到 1920 年代，这些插板可以互换。

" This does have a swappable battery, so you can work for four hours, swap the battery and then keep going."

“它有一个可更换的电池，所以它可以工作四个小时，更换电池后继续工作。

VoloCity's current range is 35 kilometers and can reach speeds up to 110 kilometers per hour, and it's all powered by nine swappable battery packs.

VoloCity目前单次可飞行距离是35公里，时速可达110公里，由九个可更换的电池组供电。