hektometer

例句：

1. 1. The distance from the city center to the airport is about 30 kilometers.
   从市中心到机场的距离大约是30公里。
2. 2.He walked for miles until he found a place to rest.
   他走了很长时间，直到找到一个地方休息。
3. 3. The train travels at speeds of up to 150 kilometers per hour.
   火车以每小时150公里的速度行驶。