n mile

例句：

1. 1. He walked for miles to reach the end of the trail.
   他走了好几个小时才走到小径的尽头。
2. 2. The train travels at a speed of 20 miles per hour.
   火车以每小时20英里的速度行驶。
3. 3. We need to cross the river and then walk for miles until we find the right path.
   我们需要过河，然后走很长一段路才能找到正确的路径。