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English

If they formed in their current locations, their orbits must originally have been circular; otherwise accretion (the coalescence of smaller bodies into larger ones) would not have been possible because the large relative velocities between planetesimals would have been too disruptive.

Chinese

假若它們是在目前的位置形成,它們的軌道必須是圓的;否則,這些天體不可能進行吸積(較小的物體聚合成較大的),因為微行星之間較大的相對速度會破壞吸積的過程。