1/hour是可数名词，最主要是看hour前的序数词是复数还是单数，是an/one用单数，other/two……用复数
2/一直都是复数
3/两者意思相同，没有差异，都表示为：一个半小时
1/one hour and a half 中的hour是单数还是复数,是根据什么确定的?
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