In a solar system in which orbits cross each other, resonances can keep the planets in stable tracks around their stars.

在太阳系，就有轨道相互交叉，共振能保持其稳定的轨道的例子。

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They are keen to cross the tracks to a new home.

他们渴望走出贫民区，拥有自己的新家。

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Barriers at a level crossing in Somerset where a man was killed were held down for longer than usual before he tried to cross the tracks, a report has found.

BBC: Barriers 'held down longer' in Somerset rail crash

New festival elements this year include Cross the Tracks, a strand that throws the spotlight on contemporary, underground music influenced by jazz.

BBC: Mud Morganfield

They are keen to cross the tracks to a new home.

ECONOMIST: China��s economic boom can survive a property bust