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.
Single dose of potent psychedelic drug could help treat depression, trial shows。关于这个话题，旺商聊官方下载提供了深入分析
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据乌克兰国际文传电讯社2月27日消息，乌克兰总统泽连斯基在接受英国天空新闻频道采访时说，如果俄罗斯近期不同意举行乌美俄三方元首会晤，俄乌冲突将会“旷日持久”。