Leigh and his team did something similar, but used metal ions as the fingers to keep the knot tying organized.

利和他的团队做了类似的事情，不过他们用金属离子代替“手指”来打结。

And then mum pulls her finger out-we extract the metal ions out-and you're left with just the knot at the end.

“然后妈妈抽出手指，而我们提取出金属离子，最后只剩下打得结。”

Electrolysis is used for lots of other things too, like coating jewelry or flatware with gold or silver, refining metals or separating mixtures of metal ions.

电解也用于许多其他用途，例如在珠宝或餐具上涂上金或银、精炼金属或分离金属离子混合物。

Meanwhile, the opposite happens at the cathode rod, where metal ions from the solution gain electrons and precipitate on to the cathode as pure metal, gradually growing larger.

与此同时，相反的情况发生在阴极棒上，溶液中的金属离子获得电子并以纯金属的形式沉淀到阴极上，逐渐变大。

The circuit is completed by the wire, but also by a salt bridge, which is also a U-shaped tube that contains a salt solution that allows the metal ions to go from the anode to the cathode.

电路由电线完成， 但也由盐桥完成，盐桥也是一个 U 形管， 内含盐溶液，可让金属离子从阳极流向阴极。