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.
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Now let’s revisit the selector wildcard examples from the beginning using BPatterns.，这一点在91视频中也有详细论述
The latest test of Space X's giant Starship rocket has failed, minutes after launch.