光伏能源行业的重要性可以通过壳牌和英国石油这样的石油巨头在这一行业的存在来衡量，他们2004年的太阳能电池产量已经分别占到了全球市场的6%和7%。

The importance of the PV energy sector can be gauged by the presence of oil majors such as Shell and BP, whose solar cell production have reached 6% and 7% of the global market respectively in 2004.

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