根据魏的逻辑：由于可供选择的女性越来越少，父母们会有更加强烈的储蓄动机，以便让自己的儿子获得更有竞争力的婚姻前景。他们会一直这么做，直到儿子发育成熟并进入婚姻市场。
Wei's logic: With fewer available women, parents have a much stronger incentive to save to make their sons attractive marriage prospects, as do the sons as they mature and enter the marriage market.
第三，因为燃料电池发动机的使用费用比内燃机发动机低，燃料电池发动机很快就会在价格上很有竞争力了。
Third, fuel-cell engines will soon be economically competitive because people will spend less money to operate a fuel-cell engine than they will to operate an internal-combustion engine.
目前为止，氢燃料电池发动机是最有竞争力的汽车动力代替品。氢燃料电池发动机是用氢作燃料产生电能以充当汽车的动力。
By far, the most promising alternative source of energy for cars is the hydrogen-based fuel-cell engine, which USES hydrogen to create electricity that, in turn, powers the car.
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