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1·Triton will one day enter within Neptune's Roche limit and become totally obliterated.

崔顿将缓慢地经螺旋轨道接近海王星，而当它到达洛希极限时最终将被海王星的引力撕成碎片。

2·But how can the differentiated satellite be brought so close to the planet, within the Roche limit?

但这些已分化的卫星是怎么进入土星洛希极限内的？

3·Yet Saturn's rapid rotation meant it could hold a satellite within its Roche limit until the bombardment.

然而，土星的高速自转意味着它能够在洛希极限中保持着一个卫星直到“猛烈轰击”。