名词
中文翻译：公里
同义词：
['mile', 'kilometer', 'meter例句：1. The distance between the two cities is about 50 kilometers.（两座城市之间的距离大约是50公里。）']
例句：
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1. The distance between the two cities is about 50 kilometers.
两座城市之间的距离大约是50公里。
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2.He walked for 30 kilometers to reach his destination.
他走了30公里到达了目的地。
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3. The marathon race lasted for 2 hours and 45 minutes, covering a total of 10 kilometers.
马拉松赛跑持续了2小时45分钟，总共跑了10公里。