千米
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定义
公制长度单位，等于1,000米或约0.621371英里。
解释
The kilometer is the standard unit for expressing road distances and geographic measurements in metric countries. The Earth's circumference is approximately 40,075 km; the distance from New York to Los Angeles is about 4,500 km. At 100 km/h (the common highway speed limit in metric countries), a vehicle covers 1 km every 36 seconds. One kilometer equals 1,093.61 yards or 3,280.84 feet.
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