The animals have trekked about 500 km over the last month from their original habitat.

过去一个月，象群从原栖息地跋涉了约500公里。

The diameter of the Earth is about 13,000 km.

【diameter】地球的直径约为13,000公里。

According to recent reports, areas at least 19 miles (30 km) away from the accident site, are mostly radiation free, although some lakes and forestland are no-go areas or are at least restricted to the public.

根据最近的报告显示，距离事故现场至少19英里(30公里)的地区，大部分都还未被辐射污染，只有一些湖泊和林地是禁区，或者至少不对公众开放。

In total, there are more than 700km of shelves, and most of them are stacked up here, in one of the colossal low-oxygen storage buildings in Boston Spa in Yorkshire.

总共有超过 700 公里长的书架，它们大多数都被置于约士顿，温泉镇一座的低氧储藏设施中。

Inside, 20 km of galleries house thousands of works of art.

博物馆内，两万米长的画里陈列着成千上万件艺术品。

Hmm. Well, I have to guess and I’m going to say b) 1km.

啊，我只能猜了，我选择b)1000米。

Nasa successfully smashes spacecraft into asteroid 11 million km from Earth.

美空天局成功将天器撞向距离地球 1100 万公里的小行星。

Its width varies from between 30 to 45 miles, that's 50 to 70 km.

它的宽度从30到45英里不等，也就是50到70公里。

Its' about 50km away from my home.

离我大约50公里。

Eventually, Jeme got the assignment as the chief engineer of the 37km stub line.

最终，詹天佑被任命为这条37公里铁路线的总工程师。

It was followed by the longest leg of 1950 km to Karachi, India.

其次是最长的一段，1,950 公里，到达印度卡拉奇。

The flight lasted around 11 minutes and took the six women more than 100km (62 miles) above Earth, crossing the internationally recognised boundary of space and giving them a few moments of weightlessness.

这次飞行持续了大约11分钟， 将六名女性送到了距地球100公里（62英里）以上的高空，跨越了际公认的太空边界， 让她们体验了几分钟的失重状态。

That is one intervention about every 8,047 km of autonomous driving.

这意味着大约每8047公里的无人驾驶才需要一次人工干预。

Most ambitious is an attempt to drill 2.5km into Antarctica's highest ice dome.

其中在南极洲最高的冰穹钻入2500米的尝试非常有野心的。

A rocket needs to reach a velocity about 40,000km an hour to escape from Earth.

火箭需要达到每小时约四万公里的逃逸速度来脱离地球。

When the wind gets going, their blades can spin at well over 200km per hour.

当有风时，它们的叶片可以以每小时200公里的速度旋转。

Their laser and receiving apparatus were in a second apartment block 1.43km away.

他们的激光及接收设备位于1.43公里外的第二栋公寓楼内。

In the ocean, they're on a much larger scale, like 10-100km in diameter!

在海洋中，漩涡的规模要大得多，直径可达 10-100 公里！

Tens of millions of people within 1,000 km of the eruption would die.

距离火山 1000 公里内的数千万人将会死亡。

The island is about 1,140 km from the southeastern state of Espirito Santo.

该岛距离东南部的圣埃斯皮里图州约1140公里。