佛山市图书馆

Hour—a measure of time，60minutes（时间单位，60分钟）例如：
  （1）There are 60 minut-es in an hour.
  一小时有60分钟。
  （2）please come back in an hour's time.
  请在一小时内回来。
  o'clock——aword we use to say the time
  （是一个用来说明时间的词）
  ——what time is it？ 什么时候？
  ——It's 9 o'clock. 是九点钟。
  如果我们说：“从这里到广州乘汽车需要四小时。”这里“小时”用“hour ”，“四小时”是“four hours。”
  It takes four hour from here to Guangzhou by bus
  如果我们说：“我已等了你两个小时。”或者说：“我从两点就已经等你。”前一句“两个小时”用“two hours”后一句“两点”用“two o'clock ”。
  I've waited for you for two hours.
  I've waited for you since two o'clock.
  Ex. 用hour（s）或o'clock填空：
  1. Mary's been here since one_____.
  2. John's been here for one____.
  3. I've been waiting here for____.
  Key:1. o'clock 2. hour 3. hours
  （石零）