If you're dealing with only a single observation point, which is usually the case, you can use either the capture or bubbling phase — there's no real difference.

如果处理单个观测点——这也是最常见的情况，使用哪个阶段都行，两者没有实际区别。

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Six have income ceilings, with five different formulas for the limits, in each case involving two phase-out schedules, one for single filers and one for joint filers.

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