If the reaction took hours, and not seconds., the fuel costs would be prohibitive.
假如这一反应需要数小时而不是几秒钟，那么燃料成本就太高了。
If five seconds after timing is over, then press the button will not display.
若五秒计时结束后，再按下按键也不会显示。
If five seconds after timing is over, then press the button will not display.
若五秒计时结束后，再按下按键也不会显示。
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