Electric motors do not need a gearbox, which reduces weight and mechanical complexity.

电动机不需要齿轮变速箱，因此可以减轻重量和机械复杂性。

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Hence, it can only be done at later stages of the software existence, in the way Facebook did it, progressively adding complexity after it has already reached a certain weight.

因此，这只能在软件存在的后期用Facebook进行的方式来完成，在它已经具备一定影响力之后再逐步增加复杂性。

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Efficiency costs money, safety adds complexity, performance increases weight.

效率花费金钱，安全增加复杂性，性能增加重量。

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Each of Iridium's 66 satellites has its own phone-switching system, boosting coverage and performance at a cost of complexity and weight.

FORBES: Surviving Iridium

Meanwhile, keeping them cool adds further to the complexity and weight.

ECONOMIST: Tech.view: Boost for Formula One | The