If a spacecraft travels faster than 11 km a second, it escapes the Earth's gravitational pull.
如果一架宇宙飞船飞行超过每秒11公里，它就能摆脱地球引力。
Johann Franz Encke, Director of the Berlin Observatory, finally determined a value for the AU based on all these parallax measurements: 153,340,000 km.
柏林天文台主任约翰·弗朗茨·恩克最终根据所有这些视差测量结果确定了天文单位的一个值为153,340,000公里。
For those uninitiated in scientific ocean drilling, the previous record was a little over 4 km.
可以告诉没有海洋科学钻探知识的人，先前的纪录是四公里过一点儿。
You start by running 5 km, move up to a 10 km, then a half marathon.
你先跑5公里，再跑10公里，然后跑半程马拉松。
Indianapolis is best known for the Indianapolis 500, which is a popular 500-mile (805 km) automobile race held once every year.
印第安纳波利斯最著名的赛事是印第安纳波利斯500，这是一场每年举行一次的、受欢迎的500英里（805公里）汽车赛。
With a speed of 250 km per hour, it's also the first mountain heavy train line to provide a 4G network.
它的时速为250公里，也是第一条提供4G网络的山地重载铁路线。
According to a report, Google's self-driving cars clocked 1,023,330 km, and required human intervention 124 times.
据报道，谷歌的自动驾驶汽车行驶了1023330公里，期间需要人工干预124次。
An arctic tern, on its 20,000 km flight from the extreme south of South America to the Arctic circle, will take no notice of a nice smelly herring offered from a bird-watcher's boat along the way.
北极燕鸥在从南美洲的最南端飞往北极圈的路线全长2万公里，但燕鸥这一路上都不会留意观鸟船送来的散发臭味却又可口的鲱鱼。
It flies at 240 km per hour at a height of 4,500 meters in the sky.
它在4500米的高空以每小时240公里的速度飞行。
As the probe is 320 million km away from Earth, there is a signal delay of over 10 minutes if the research team tries to control it from Earth.
由于探测器距地球3.2亿公里，如果研究小组在地球上控制探测器，会有10分钟以上的信号延迟。
Itsrevolutionary technology means that propulsion comes from the track, not thetrain, resulting in low noise, speeds of up to 285 km/h and a journey time ofjust eight minutes.
采用革新技术的磁悬浮列车依靠轨道的推力前进，而非火车车身。 因此，运行过程中，噪音极低，时速达285公里，浦东到市区只需八分钟。
By 1918 the Germans had constructed some trench systems that had a depth of 14 miles (22 km).
1918年时，德军已经建造了一些纵深达到14英里(和22公里)的堑壕体系。
Then infantrymen separated for groups, ran about a km and occupied trenches for repelling an enemy's counterattack.
然后，步兵分为几个作战小组，跑了大概一公里并占据了壕沟，抵御敌方的反击。
That would mean an annual loss of 3, 250 sq km a year, a good chunk of rainforest but less than the area of discarded pasture that returns to forest each year.
这就意味着每年森林消失面积为3,250平方公里，对雨林来说的确不小，但还不如每年回归森林的废弃牧场面积大。
Racing over in his car, he smashed into a concrete barrier at 140 km an hour in a 50 km zone.
他在限速50公里区内急速行驶，以每小时140公里的速度撞到一个水泥墩上。
The rollover accident happened at a curve just 9 km from the start point.
翻车发生在距离出发点9公里左右的一个弯道。
Master Gunnery Sgt Charles Padilla, the one US Marine, achieved a personal goal of 85 miles (137 km) in one day, which sparked a friendly trans-Atlantic rivalry.
唯一的一名美国海军军士长查尔斯·帕迪拉就创下了一天之内跑85英里（137公里）的个人最好成绩，而这引起了一场跨越大西洋的友谊赛。
Located at the mouth of the Yangtze River, the island is China's 3rd biggest island, with an area of 1267 sq km and a relatively intact ecology system.
崇明岛位于长江口，是中国第3大岛，面积1267平方公里，生态环境相对完好。
Given the size of the quake, damage can be expected with a 100 km radius of the epicenter, says Robbie Morris, a project scientist with the Australian Tsunami Warning System.
考虑到这次地震的级别，预计破坏范围在距震中半径100公里的范围内。
The shooting stars are falling at a speed of 66 km per second.
该流星群速度可达每秒66公里。
500 km of a perfect road to Udachny (" Lucky ").
意为‘幸运’，的一条500公里的完美之路。
In Bagamongone, a small town 20 km from Yaloke, another case was reported during the same period.
同一时间内，在离亚洛凯20公里的一个小城镇Bagamongone报告了另一例病例。
The Red Planet is currently around a 100 million km distant from us and shines like a brilliant red beacon as it rises in the east on its journey across the night sky.
这个红色的星球目前离我们大约是1亿公里，当它在东方的夜空升起时就象一盏红色的指路明灯那样耀眼。
"When you sail at very high speeds, around 100 km/hour, the water becomes like a rock," he said.
“当你以非常高的速度航行时，大约每小时100公里时，水相对于你来说变得就像是石头，”他说。
Regardless, passengers will spend a few hours cruising silently 36 km above the earth before beginning their descent.
无论如何，乘客在开始下落之前将需花几个小时在地球36千米上空巡航。
In 1988, China built its first expressway, between Shanghai and Jiading, with a length of 18.5 km.
1988年，长度为18.5公里的上海至嘉定高速公路成为中国第一条高速公路。
Added to this that a tunnel would have to be about 50 km long and that the removal of earth would require a fleet of trucks etc it is liable to detection.
此外，一条长达50公里的隧道必然要挖出大量的土方，需要大量的卡车装载运出，诸如此类的事件都使得隧道很容易被发现。
Added to this that a tunnel would have to be about 50 km long and that the removal of earth would require a fleet of trucks etc it is liable to detection.
此外，一条长达50公里的隧道必然要挖出大量的土方，需要大量的卡车装载运出，诸如此类的事件都使得隧道很容易被发现。
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