translation.en: But, when it's open, because these ions have to line up and flow through, one at a time, you get a kind of sporadic, not steady -- it's a sporadic flow of current.
translation.zh: 但是，当它打开时，由于这些离子必须排成一行 一个一个地穿过小孔，因此产生零星的，而非稳定的—— 一股断断续续的电流。