The energy captured by space-basedphotovoltaic arrays would be converted into microwaves for transmissionto Earth, where it would be transformed into direct-current electricity.

空间光电池阵列所收集到的电力将在转换成微波后发射到地球，再在地面上转换成直流电。

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Even Thomas Edison bet badly, as in his development of direct-current electricity that proved inferior to alternating current.

WSJ: Boeing Shows How Innovation Can Be Messy

Its high-voltage direct current system is delivering electricity to the British Petroleum platform in the middle of the ocean.

FORBES: Magazine Article