smell的过去式、过去分词和现在分词

　　例句：1、Recycling plastics and aluminum, for instance, uses only 5% to l0% as much energy as producing new plastic or smelting aluminum ．

　　例如,回收塑料和铝所消耗的能量只有生产新塑料或冶炼铝的5%到10%。

　　2、Darby was looking for a way to improve iron when he hit upon the idea of smelting it with coke instead of charcoal.

　　达比一直在寻找改善铁质的方法，他猛然想到可以不用木炭熔炼，而改用焦炭。

　　3、The room smelt strongly of polish.

　　那个房间里散发着浓浓的上光剂的气味