processing, but it should be used with care and with an understanding of its
According to Reddit, that human element it key.
，推荐阅读搜狗输入法下载获取更多信息
Failed Units: 1
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.