航天飞机发动机内的这三个阀门不断被更换，以确保它们是最有效的，能保障飞行的安全。
The three valves in the shuttle's engine compartment kept being replaced to ensure they were the best available and safe to fly.
劳斯莱斯公司通过长期测评其全球喷气式发动机的工作情况，可以预测发动机在什么时候更有可能出现故障，从而安排顾客更换发动机。
By continuously dassessing the performance of its jet engines around the world, Rolls-Royce is able to predict when engines become more likely to fail so that customers can schedule engine changes.
遍布广泛的加油站为汽油发动机提供了安全保障，可为何就不能兴建新设施为汽车更换电池呢？
Instead of a petrol engine, with its widespread infrastructure of filling stations providing the security blanket, why not build new infrastructure to refuel cars with new, fully charged batteries?
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