The chemist reduced water by electrolysis.是什么意思？

The chemist reduced water by electrolysis.

化学家用电解法把水还原为氢.

the

art. 指已提到的人（物），指说话人与听者已知的人（物），用于独一无二的事物前，与形容词最高级和序数词连用；

例句
He did have a real knowledge of the country...
他对该国的确知之甚多。

chemist

n. 化学家，药剂师，药商，药房；

例句
There are many creams available from the chemist which should clear the infection...
很多能够消除这种感染的药膏在药店就能买到。

reduced

adj. 减少的，简化的；v. 换算( reduce的过去式和过去分词 )，约束，使变为，使变弱；

例句
Those booking a block of seats get them at reduced rates.
团体订座可享受折扣价。

water

n. 水，雨水，海水，海域；v. 给…浇水，供以水，加水稀释，流泪；

例句
...a licence to abstract water from the River Axe...
从阿克斯河中抽水的许可证

by

prep. 在…旁边，表示方式，由于，经过；adv. 经过，表示保留或保存时用，短暂拜访；

例句
...expensive make-up that we saw being advertised by a beautiful model...
我们所见的由一位漂亮模特代言的昂贵化妆品

electrolysis

n. 电解，电蚀，电蚀除瘤[毛发等]；

例句
The influence of the distances between anticathode and cathode and electrolysis voltages on dimples was investigated.
探讨了电解电压和阴阳两极之间的间距对电解加工的影响.