The top of this mountain is three kilometers above the sea level.

这座山的山顶海拔三千米高。

youdao

I ran three kilometers to school only to find that it was Sunday.

我跑了三公里到了学校，结果发现是星期日。

youdao

If m is the mass of the sun, the radius of the event horizon is three kilometers.

视界的半径就是，3公里，若m是太阳的三倍重。

youdao

It contains seven kilometers of paths for horseback riding and about ninety-three kilometers of walking paths.

VOA: special.2009.10.30

For the thousands who live in Bulo Bacley, the nearest water well is three kilometers away.

VOA: standard.2009.10.06

Instead,he traveled only three kilometers by local bus to this vision center in his village.

VOA: standard.2010.05.25

There is seepage about three kilometers away from the wellhead.

WHITEHOUSE: Press Briefing

Our first incentivized competition, the Ansari X PRIZE, went to Scaled Composites, which beat out 26 teams from seven countries to become the first to build and launch a private space vessel that could carry three people 100 kilometers into space twice within two weeks.

FORBES: Launching the Next Era in Space Travel and Exploration

Quebec provincial police said later that they had arrested three people about 50 kilometers (30 miles) north of the Saint-Jerome jail from which the inmates escaped.

NPR: 2 Inmates Escape From Quebec Jail In Helicopter