轨道运行

Explanation: Put a satellite in a circular orbit about 42,000 kilometers from the center of the Earth (36,000 kilometers or so above the surface) and it will orbit once in 24 hours.

解释：一旦在24小时中，把一卫星放在一离中心大约42，000 kilometers地球(36，000 kilometers左右在表面)和它之上的圆的轨道里就将绕轨道运行。

They all like steetcars running contentedly on their rails,and they dispise the sprightly flivver that dashes in and out of the traffic and speeds so jauntily across the open contry.

他们就象街上的有轨电车，精准地在固定的轨道运行，而对那些不时出没于车水马龙和欢快的奔驰在乡间的廉价小汽车不屑一顾。

It is also known as Hesperus, the evening star, or Phosphorus, the morning star.

金星是天空中除太阳和月亮以外最亮的星体，沿着离太阳约1亿6百万公里的椭圆轨道运行，运行一周约需要225天。

Trying to describe how the five planets in the night sky followed seemingly irregular paths, Ptolemy hit upon an idea he called epicycles .

当设法解释夜空中的五颗行星为何好象沿着不规则的轨道运行时，托勒密脑海中闪现出一个观念，他称之为"本轮"。

And it's just clawing its way. It's howling.

它正按照它的轨道运行。

But rather, it had a hyperbolic orbit...

而是按双曲线轨道运行。。。

While Shepard and Mitchell worked on the lunar surface, their crewmate Stuart Roosa orbited the moon in their command module. They left the moon on Feb. 6, 1971 and returned to Earth three days later.

谢泼德和米切尔在月球表面工作时，他们的同伴斯图尔特·罗萨则留在绕月球轨道运行的指令舱内。1971年2月6日，二人离开月球，3天后重返地球。

"Partially reusable rocket -launched vehicle developed by NASA to go into Earth orbit, transport people and cargo between Earth and orbiting spacecraft, and glide to a runway landing on Earth."

由美国国家航空暨太空总署研制的进入地球轨道，为地球和轨道运行航天器运送人员和货物，并能滑翔回地面着陆的可部分重复使用的火箭助推的运载机。

Now according to Newtonian theory, some of them moved in hyperbolas or parabolas never to return; others moved in ordinary ellipses.

现在，牛顿理论认为，有一些彗星沿双曲线或抛物线运行，永远不再返回；另外一些彗星沿普通的椭圆轨道运行。

Because of having big gap between rail s and situating floating status of I-beam girder of rail foundation at production area of coke oven the unstability operation or off the rail could be easy happening.

分析认为拦焦车轨道运行状况较差的原因是拦焦车轨道轨距较大，炉区轨道基础工字钢梁处于浮动状态，极易因轨距进一步扩大而威胁车体平稳运行甚至造成拦焦车脱轨。

As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸，那乌黑、忧郁的眼睛，她便会相信，他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失