With this new impetus, engineers and start-up companies have jumped at the challenge, and while beamed power is still in its infancy, three viable options seem to be emerging.

有了新的动力，众工程师和创业公司跃跃欲试，纷纷加入挑战。目前光束电力仍然处于起步阶段，有可能出现三种技术选择。

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The energy concentration in nuclear power plants is just one reason why nuclear remains so attractive, despite the high start up costs.

核电站高度集中的能量是核电尽管造价不菲，却仍然如此富有吸引力的原因之一。

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If your doctor told you that you need to lift weights, you would start with light weights, gradually working your way up to the heavy ones, thereby increasing your power.

如果你的医生告诉你，你应该举重，你应该从较轻的重量开始，逐渐加重到更重的重量，由此来增加力量。

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