We analyzed the characteristic of carbon -free carbon paper eliminated with soluent mixed and established a method for developing the original writings.

针对利用无碳复写纸进行的犯罪活动，通过找出天那水消褪无碳复写纸的消褪特征，并建立相应的检验方法。

youdao

Mr. Obama's plan to curb carbon dioxide emissions, though necessary, will be far from cost-free, whatever his sunny speeches on the subject might suggest.

尽管奥巴马的二氧化碳减排计划是必要的，但这远不是免费的，无论他在这个问题上发表的充满希望的演讲可能会暗示什么。

youdao

Mr. Obama's plan to curb carbon dioxide emissions, though necessary, will be far from cost free, whatever his sunny speeches on the subject might suggest.

尽管奥巴马的二氧化碳减排计划是必要的，但无论他在这个问题上发表的充满希望的演讲可能会暗示什么，这远不是免费的。

youdao

The better way would be through some sort of carbon tax, which would penalise fossil fuels but not any fuel free of carbon emissions, whether nuclear power or renewables.

ECONOMIST: A renaissance that may not come

But if gas is plentiful and cheap enough to replace carbon-rich coal, it will also be in a position to replace carbon-free nuclear and renewables, and in doing so more carbon dioxide will be emitted than would otherwise be the case.

ECONOMIST: Natural gas

Calculate carbon offsets for your car, plane or train trip with the free United Nations Environment Programme Carbon Calculator iPhone app.

BBC: How big is your carbon footprint?