They whizz through optical fibres, rarely getting lost or interfering with one another (which is why different coloured signals can be sent down a single fibre, to multiply its capacity).

它们通过光纤飞速传输，几乎不丢失数据也不被其他东西干扰（这就是为什么不同的信号可以在同一根光纤中传输以倍乘它的容量）。

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Durban, in South Africa, is perhaps the most efficient: containers whizz through in a few days.

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