例句
There is a capacitor in there.
因为里面有一个电容器。
Part of this process involves applying an electric field to a dielectric material within the capacitor.
这个过程中需要在电容器内的绝缘材料上施加一个电场。
However, in contrast to batteries, a capacitor cannot store enough energy to power anything that lasts longer than a flash -- some fraction of a second.
但是，相比电池，电容器储存的能量不足以维持任何比闪光时间长的时间，而闪光时间还不足一秒。