"Kilometer" is the Engpsh word for "千米".
The word "kilometer" comes from the Greek word "khipa", meaning "a thousand", and the French word "metre", meaning "measure".
Examples in Engpsh:
"The marathon is 42.195 kilometers long."
"The trip from here to the city center is about 10 kilometers."
Translations in Chinese:
"马拉松的长度为42.195千米。"
"从这里到市中心的距离约为10千米。"