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.
《殉道学》还纳入了塔可夫斯基本人保存的信件、剪报、电传等文本，收录了近 200 幅手稿、绘画和工作照，这些细节让文字变得可触可感，将他在拍摄现场的执着、家庭生活的纠葛、病痛中的煎熬呈现在读者面前。
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They also said autism "can be a barrier but it can also be a strength" but many employers do not understand this.