More than one-quarter of the world's oil and almost one-fifth of the world's natural gas come from offshore, even though offshore drilling is six to seven times more expensive than drilling on land.
全球超过四分之一的石油和近五分之一的天然气来自近海，尽管近海钻探的成本是陆地钻探的六到七倍。
The fourth assessment report was published in 2007; the fifth is slated to come out in installments starting in 2013 and finishing in 2014.
第四次评估报告发表于2007年，第五个预定从2013年开始2014年结束以分期方式发布。
One is cannibalisation; about a fifth of CitiDirect's deposits, for instance, have come from its own branch customers.
其中一个是“同根相残（cannibalisation）”。 举例说，CitiDirect五分之一的存款来源于原本属于自己分支的顾客。
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