For civil airplane, the good or the bad of its maintainability will directly affects its whole life costs and affects its competition in the market.
对于民用飞机，其维修性的好坏将直接影响其全寿命周期费用，也将影响其市场竞争力。
To maximize the whole utility in life cycle, households need to weigh moving costs and loss of utility caused by unmoving.
为了最大化整个生命周期的效用，家庭通常需要权衡迁居的交易成本和不迁居的效用损失。
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