帮忙翻译一下
Incineration
Volume Reduction
6 Large numbers of batch-fed incinerators built during the 1930’s and 1940’s to reduce waste volume were major contributors to air pollution , performed poorly , and were costly to maintain .Some of these were upgraded , but most were shut down and replaced by land disposal of refuse whenever possible .
7 However , as landfill capacity decreased , volume reduction became more important 。
8 At the same time , the fuel value of refuse had been rising steadily .
参考答案:焚化量缩减
6.大量的为了减少垃圾而建于20世纪30年代到40年代间的大容量焚化炉是空气污染的主要制造者，它们效率低，而且维修昂贵。其中的一些更新了，但多数已被关闭并在任何可能的时候被垃圾陆地处理所取代。
7.然而，随着垃圾掩埋能力的下降，容量减小变得越来越重要。
8。同时，垃圾的燃料价值得到了稳定的提升。