The project started in 2000, when the first two Beidou satellites were launched into geostationary orbit.
该项目始于2000年，当时最初两颗北斗卫星发射到地球静止轨道。
About every two years, however, the Earth passes Mars as they orbit around the Sun.
大约每隔两年，地球会在绕太阳运行的轨道上经过火星。
As Kepler showed, the Earth's orbit is an ellipse, with the sun at one of the two focal points.
开普勒曾表明，地球的轨道是一个椭圆，这个椭圆有两个焦点，太阳在其中一个上。
Two Chinese astronauts are currently in orbit practicing procedures and testing technologies for the space station.
两名中国航天员现在在轨道上测试太空站的相关技术。
Based on the research of orbit determination by using two GPS satellites, this paper discusses the initial value problem and provides an effective method of getting initial value.
研究了用两颗全球定位系统(GPS)卫星粗略确定低轨卫星轨道的问题，并着重讨论了其中的初值问题，给出了一种有效的初值方法。
The two spacecraft will link up in orbit.
两艘宇宙飞船将在轨道上对接。
The two space craft will link up (with each other) in orbit.
两艘宇宙飞船将于轨道上(互相)连接。
The larger of the two will loft the lunar lander and other equipment into Earth orbit.
两者中较大的一个将发射月球着陆器和其它的设备进入地球轨道。
Last year, two satellites even collided, showering their orbit with tiny fragments that now pose additional risk to operational spacecraft.
去年甚至还发生了两颗卫星相撞的事件，碰撞所产生的碎片散布在整个轨道上，更增加了其他航天器的运行风险。
The orbit of the earth around the sun is eccentric because the orbit is slightly elliptical and so has effectively has two centres (neither of them the centre of the sun).
地球环绕太阳的公转轨道是偏心的，这是因为地球的公转轨道稍微呈椭圆形，所以这个轨道实际上就有两个中心（这两个中心都不与太阳的中心重合）。
Ten countries (or groups of countries) and two commercial consortia can launch satellites into orbit.
10个国家(或国家集团)以及2个商业财团可以把卫星送入轨道。
Although our solar system only has one star, most stars like our sun are not solitary, but are binaries where two stars orbit each other a pair, or multiples involving even more stars.
虽然我们的太阳系只有一颗恒星，但其实大部分和我们太阳相似的恒星都不是单个的，而是由两个恒星相互旋转组成的双星系统，或者甚至包含更多恒星的多星系统。
The next two years, I spun further out of my father's orbit.
在以后两年里，我与父亲的距离拉开得更加遥远。
The rendezvous and docking (RVD) between two spacecrafts in space involves both orbit control and attitude control with up to 12 degrees of freedom.
空间交会对接涉及到两个航天器同时要进行多达12个自由度的轨道和姿态控制问题。
The delay disappointed the astronauts' families, who were waiting at Kennedy Space Center for their loved ones' return after nearly two stressful weeks in orbit.
计划的推迟让宇航员的家属们很失望，他们正在肯尼迪航天中心等待亲人在近两周艰苦的太空工作后能平安归来。
Russian space experts will pick one of the two men, both Muslims, to go into orbit on September 2 next year.
俄罗斯航空专家将从两人中挑选一名于明年9月2日进入太空。
The delta-winged Columbia, before reaching the orbit, jettisoned its dual booster rockets two minutes into flight.
三角翼的哥伦比亚号航天飞机在进入轨道前，起飞两分钟就抛下其两个助推火箭。
The delta-winged columbia, before reaching the orbit , jettisoned its dual booster rockets two minutes into flight.
三角翼的哥伦比亚号航天飞机在进入轨道前，起飞两分钟就抛下其两个助推火箭。
Its parent star is similar to the sun, again unlike those of the other two candidates, both of which orbit cooler, dimmer stars.
它的母恒星与太阳相似，这又与其他两个候选外行星不同，其他两个候选外行星都环绕较冷的、较昏暗的恒星运行。
The company already has two scaled-down versions in orbit.
比奇洛的公司已经有两个缩小版在轨道上运行。
The radiant cooler used in the sun synchronous orbit is always designed two stages with a W-shaped parabolic reflector.
在太阳同步轨道卫星上应用的辐射制冷器都采用两级抛物面w型的结构形式。
The unmanned probe launched March 31, 1966, and entered orbit around the moon two days later.
这艘无人驾驶的航天器发射于1966年3月31日，并在两天后进入绕月轨道运行。
The trip, which lasted more than two days, was the first to take the shuttle into orbit.
这次持续超过两天的飞行是航天飞机第一次进入太空轨道。
As an eclipsing binary, it is actually two stars in close orbit around one another.
作为食双星，它实际上是两颗在接近的轨道上互绕的恒星。
As an eclipsing binary, it is actually two stars in close orbit around one another.
作为食双星，它实际上是两颗在接近的轨道上互绕的恒星。
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