noun 下载 🔗分享 千米,公里 (official BIPM spelling, Australian, New Zealand, Irish, Indian and South African spelling) An SI unit of length equal to 103 metres. Symbol: km Examples : "The marathon is a race of just over 42 kilometres. " 马拉松比赛的赛程略多于42公里。 unit math science technical geography 与AI对话词汇游戏阅读练习