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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尽管邮储银行的不良贷款率长期保持在1%以下，优于其他国有大行，但拉长视线，该指标的上扬趋势值得警惕。
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