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。
They do not perform any transactions on your site and drop off within seconds.
他们没有在您的网站进行任何交易，并在几秒钟内下降了。
They do not perform any transactions on your site and drop off within seconds.
他们没有在您的网站进行任何交易，并在几秒钟内下降了。
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