art.

1. 一
   It took us an hour and a half to finish the job.

   我们花了一个半钟头才做完。

   Stan is an old friend of mine.

   斯坦是我的一位老朋友。

2. 任一
   In Britain, an engine driver is a person who drives a railway engine.

   在英国，engine driver指火车司机。

3. 某一
   An American student wants to see you.

   一位美国学生想见你。

4. 每一
   He was paid seven dollars an hour.

   他每小时的工资是七美元。

det.