A dark color adds intensity to the fire and keeping the background simple to begin with is important to ensure that you concentrate on the fire itself.

深色可以给火焰增加亮度，而且要确保你的注意力在火焰本身上，保持背景的简单是很重要的。

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When the house is burning down you concentrate on putting out the fire, not on preventing future ones.

当房子都要烧为平地，当然是要全力灭火，而不是防范以后的火灾。

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As early as the 7th century B.C., people used simple magnifying glasses to concentrate the light of the sun into beams so hot they would cause wood to catch fire.

早在公元前7世纪，人们就利用简单的放大镜将阳光集成一束，利用热量点燃木材。

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Given the uncertain economic picture, Labour should "concentrate its fire" on the coalition, Mr Darling said.

BBC: Darling urges Labour caution over spending debate

But whereas most other states concentrate their fire on the tobacco industry, the state's Department of Public Health now believes it is necessary to make targets of the smokers themselves, and get them to quit.

ECONOMIST: The anti-smoking campaign

My long bones in my arms and legs felt like someone was ramming a long steel rod into them, my joints all creaked and popped in and out and ached like the worst arthritis ever. my skin was on fire and my extremities, especially my hands and feet, where it seemed to concentrate.

FORBES: Move up http://i.forbesimg.com t Move down