In all cases this means that the position of a planet along its orbit ultimately becomes impossible to predict with any certainty (so, for example, the timing of winter and summer become uncertain), but in some cases the orbits themselves may change dramatically.
在所有的情形下，这意味着一个行星在它轨道上的位置终将变得无法以任何确定性预测（因此，比如說，冬夏的时间变得不确定），但有些情形下轨道本身可能会剧烈变动。