Three other extrasolar planets believed to be of rocky composition have been reported, but they orbit a pulsar - the flashing corpse of an exploded star - rather than a normal type of star.

之前人们曾报道过另外三颗据信由岩石组成的太阳系外行星，但是，它们是围绕着一颗脉冲星(恒星爆发后遗留的发光的残存物)运转的，而不是一颗常态的恒星。

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Our computer simulations have shown that this type of orbit can be stable, but if you change things around just a little bit, it can become unstable very quickly.

我们做出的电脑模拟效果图显示，这一星系的运行轨道一般来说是稳定的，但是一旦其周围的物体发生变动，它就会瞬间变得不稳定。

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As a new type of automatic door system, electric door has been employed gradually in orbit traffic vehicles.

电动门作为一种新型的自动门系统，在轨道交通车辆中被逐渐推广应用。

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Asteroids are divided into different groups such as Apollo, Aten, or Amor, based on the type of orbit they have.

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Some space experts have said that any manned Mars mission using existing rockets probably would need to have a capsule dock with some type of booster in orbit.

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With all three vehicles, Arianespace, the company that runs Kourou, will now be able to offer satellite operators a ride for any type of spacecraft to all kinds of orbit - from the low, pole-crossing orbits used by Earth observation missions, to the high, geostationary locations favoured by big telecommunications platforms.

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