Investigating Arc-spraying Rapid Tooling by the Numbers, we find that performance of spraying metal shell and the backup material influences the employ life of Arc spraying die.

本文对电弧喷涂快速制模技术进行了系统的研究，发现喷涂金属壳和背衬材料的性能优劣直接影响到整个模具的使用寿命。

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Each of those generators is the size of a bus, so it's unrealistic to think that the ship could have enough backup power on board to run services when the engines die, Herring added.

NPR: Carnival Cancels 12 More Cruises On Troubled Ship