Sit down and talk about financial goals and values. Many couples often neglect this step, even if it seems obvious and common-sensical.
很多夫妇经常会忽略这一点，即使它是那么地显而易见,是常识性的问题。
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If we had added a getValue method to class Leaf, we would either have to return some sort of flag value indicating that the method application is non-sensical or actually throw an exception.