求翻译：The reason? Perhaps many, in Washington and elsewhere, don't really understand why companies hire. Do businesses hire because Washington will spend taxpayer dollars to underwrite basic research, green energy, high-speed rail, and other politically popular programs? Certainly, some do: those that directly benefit from such spending. The vast majority of U.S. companies base the decision to hire new employees on the need to fill shortages of critical skills, gain a talent advantage over competitors, or ramp up production to meet customer demand.是什么意思？

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