Aluminium and other metal smelting industries are also facing substantial short-term production problems because of the weather .

炼铝和其它金属冶炼行业也因为天气而面临严重的短期生产问题。

Chinese metallurgists are responsible for the earliest variants of iron and steel smelting processes ( 5th century b.c. ) .

中国冶金学家是最早发明各种钢铁冶炼工艺技术的人（公元前五世纪）。

However concerns that china might flood the market as a result of investment in smelting capacity have not come to pass .

市场曾担心，中国在铝冶炼产能上的投资，可能让铝供过于求，但这一担心并未成为现实。

Earlier this week , state media reported protesters had broken into a smelting works they blamed for the lead poisoning of hundreds of children in northwestern shaanxi province .

本周早些时候，官方媒体报道称，在中国西北部的陕西省，抗议者强行冲入一家导致数百名儿童铅中毒的冶炼厂。

The toxic buildup of lead , mercury , and other heavy metals in the soil and water near coal plants and smelting factories is not usually measured .

火电厂和冶炼工厂附近的土和水中所溶解了来自于铅，汞及其他重金属的毒性物质，这些毒性物质通常很难测量。