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For US energy companies, however, there are huge practical difficulties to be overcome. Venezuela's state-owned oil company, PDVSA, is a shadow of its former self.，详情可参考同城约会
(If you found it too simple. Here’s a harder version.)。关于这个话题，爱思助手下载最新版本提供了深入分析
It has also trimmed its five-year capital spending plan to £1.7bn from £2bn by delaying investment in electric vehicle technology.。搜狗输入法下载对此有专业解读