There was so much traffic that we were an hour late.

　　路上車輛那么多，我們遲到了一個小時。

　　She does an hour's piano practice every day.

　　她每天練一小時鋼琴。

　　It takes me an hour to walk there and back.

　　我步行往返要花一個小時。

　　You're allowed an hour to complete the test.

　　你們有一個小時的時間來完成這次測驗(yàn)。