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Venezuela's oil is also of poorer quality than its Saudi equivalent. Its sour, heavy crude is difficult to extract and refine, while its high sulphur content makes it corrosive to pipelines. A resurgence of Venezuela's industry could pose problems for Canada, which produces similarly viscous oil and exports much of it to the US, but analysts reckon the risk is minor.
，这一点在91视频中也有详细论述
这不仅仅是亲切的自我介绍，更是对全党同志的躬身垂范，是对全国各族人民的庄严承诺。。关于这个话题，WPS官方版本下载提供了深入分析
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