Costs this low will not be achieved without several years of operating experience and continuous development to create heat shields and rocket motors that meet the usual airliner standards of long life and low maintenance costs.

• 要使得成本降到如此低的程度，就必须具有数年的运行经验，并进行不懈的开发研究，从而生产出使用寿命长，维修费用低的热屏蔽装置和火箭发动机，以达到普通客机的这一性能标准。