8h是什么意思是几小时

　　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。