经济上的幸福感来源于知道自己走得正确，并对如何花钱做出负责任的选择。
Financial happiness comes from knowing that they're on the right path and making responsible choices with their money.
当我们不得不面对疾病甚至死亡很多人开始怀疑我们对我们的生活做出了正确的选择。
When we have to face with our illness or even mortality many of us begin to wonder if we have made the right choices about our lives.
这些模型简单，计算方便，对承包商在国际工程市场中正确选择投标项目、正确做出投标决策具有一定的指导意义。
Because the models are simple and their calculations are easy, they would help contractor to correctly choose bidding project and make bidding decision in international engineering market.
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