It 's cheaper than at the airport .

因为网上支付比在机场支付便宜。

" It 's 49 bucks cheaper through amazon , " he said to his girlfriend .

然后，他对自己的女朋友说：“亚马逊（Amazon）上的价格可比这儿低49美元。”

Won 't they just look for cheaper alternatives elsewhere ?

他们不会寻找其他更廉价的劳动力市场吗？

The goal is to drive long-term rates down , making it cheaper for businesses and consumers to borrow .

此举旨在压低长期利率，降低企业与消费者的借贷成本。

They 're theoretically cheaper to build and thus more efficient on a cost-per-kilowatt basis than conventional reactors .

从理论上说，这种反应堆的建造成本更低，因此按每千瓦造价来衡量，较传统反应堆更高效。