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1. 所以速度要翻番的话，就得需要8倍的功率才行。

   suǒ​yǐ sù​dù yào fān fān de​huà, jiù děi xū​yào8 bèi de gōng​lǜ cái xíng.

   Therefore, to go twice the speed, you need eight times the power.

   Source: CCMatrix