hour为可数名词，复数形式为hours
词汇解析：
hour
n. 小时；钟头；课时；…点钟
例句：It took him half an hour to finish the work.
他花了半个小时做完这项工作。
相关介绍
I need about an hour to finish off this report.
我需要一小时左右结束这篇报告。
There was so much traffic that we were an hour late.
路上车辆那么多，我们迟到了一个小时。
She does an hour's piano practice every day.
她每天练一小时钢琴。
It takes me an hour to walk there and back.
我步行往返要花一个小时。
You're allowed an hour to complete the test.
你们有一个小时的时间来完成这次测验。
The performance finally started half an hour late.
晚了半小时以后演出终于开始了。
