The different methods for the corrosion protection of heat exchangers were discussed and aluminum diffusion and zinc diffusion processes were high-lighted.
文章对换热器的不同保护方法进行了介绍，重点讨论了渗铝、渗锌两种方法。
2
The arc lights were sputtering overhead , and high up were the lighted windows of the tall office buildings.
弧光灯在头顶上方闪烁。更高处，写字楼的窗子里透出光明。
3
The arc lights were sputtering overhead, and high up were the lighted Windows of the tall office buildings.