a split second choice 如何理解

a split second choice 如何理解 a second time如何理解 in a split-second的意思? split-second precision是什么意思? 英语翻译A split second mental chain reaction conducted by electr all this happens in just a split second.这句split该怎么翻译? Split Second 争分夺秒有第二部吗? for a split split 请问,in a split of a second No choice,but also a choice.