An extravert has a source and direction of energy expression mainly in the external world while the introvert has a source of energy mainly in the internal world.
外向的活力表达来源和方向主要是外部世界，而内向的活力来源主要是内部世界。
And nuclear is hardly the only energy source that hasn't stood up in the free market once you factor in the external costs.
考虑到外部的成本因素，所以核电到目前为止是唯一还没能在自由市场上自主建设的能源。
But that has not dissuaded researchers from continuing to seek perfection, in the form of a compact, perpetual energy source which does not require external recharging.
然而这并没有阻止研究人员继续寻找完美的，紧凑型的永久能源，从而使得这些移植设备不再需要外部充电。
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