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有些名词的单数和复数意思完全不一样，例如：letter信letters文学good好处goods货物green绿色greens蔬菜time时间times时代custom习惯customs关税work工作works工厂；作品force力forces兵力paper纸papers文件；讲义spirit精神spirits酒精look看looks外貌manner方法manners礼貌
Some nouns have singular and plural meanings that are completely different, for example: letter letter letters literature good benefits goods goods green green greens vegetables time time times times custom custom customs duties work work factories factory; works force force forces military paper papers papers papers; handouts spirit Spirit spirits alcohol look look look looks manner method manners courtesy