是可数名词,可以加s。
The road runs for 15 kilometers along the river bank. 公路沿河岸一直延伸 15 公里。
《21世纪大英汉词典》
The airplane flies at 900 kilometers an hour. 飞机以每小时900公里的速度飞行。
但与其它词一起构成短语当定语时,不加s,就如year. a five-year-old child.
The typhoon, with 225 kilometer winds, ruined several crops including rice, corn and other vegetables.
台风风力时速225公里,摧毁了包括水稻、玉米和其他蔬菜在内的农作物。
She had to battle snowstorms, landslides, snakes and loneliness on her 350 kilometer journey.
在350公里的行程中,她要克服暴风雪、滑坡、蛇和孤独寂寞。
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