Nasa scientists are closely monitoring the skies after two satellites crashed into each other over Siberia, in what experts have said is the first collision of its kind.
在这起被称为有史以来首例的撞击——两卫星在西伯利亚上空撞击——之后，Nasa的科学家们就开始了对太空的严密观察。
The collision of the Russian and American satellites was the first of its kind in over fifty years of space travel. It spread hundreds of pieces of debris.
俄罗斯和美国卫星相撞的事件是过去五十多年太空中发生的首次类似的事件。这次的相撞在轨道上产生了几百个碎片。
The first kind of collision has been researched in detail in classical physics, no longer narrate;
第一种碰撞在经典物理中已有详尽研究，不再叙述；
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