Unable to make flame for themselves, the earliest peoples probably stored fire by keeping slowburning logs alight or by carrying charcoal in pots.
不能自己制造火焰，最早的人们存储火可能通过保持缓慢燃烧点着的原木火石或是装在罐子里的木炭。
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It has also increased their incentives to invest time and effort in acquiring skills, particularly slow-burning skills that are hard to learn and take many years to pay off.
Joe Cole signing for Liverpool is by some distance the most interesting move so far in a distinctly slow-burning summer transfer market. In part this is because player and club seem so ideally-suited.