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- 那条河长300公里。
The river is 300 kilometers in length.
- 为了安全起见，在市内开车时速不要超过三十公里。
For safety's sake, don't drive more than 30 kilometers per hour in the city.
- 飞机以每小时900公里的速度飞行。
The airplane flies at 900 kilometers an hour.
- 这架飞机可以达到每小时一千公里以上的速度。
This plane can reach speeds in excess of 1000 kilometers an hour.
- 这个农场的面积约为50或60平方公里。
The farm is about 50 or 60 square kilometers in the area.
- 这座桥差不多有两公里长。
The bridge is almost 2 kilometers long.
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