kilometre

They ran to the main road and on for a kilometre until ambulances could reach them.

接着他们就向大道跑去，到了以后再跑了一千米，直到碰到救护车。

Every cubic kilometre of the ring contains around 20 tiny particles of dust, making it so tenuous, it would be invisible from the inside.

这个光环每立方公里含有约20颗尘埃微粒，结构非常稀薄，站在光环内部都看不见它本身。

It seems to have lost an entire 40-kilometre-long flank in one catastrophic event, say the researchers.

研究人员说，它似乎在一次灾难性事件中已失去了长达40公里的整个侧翼。