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.
（二）殴打、伤害残疾人、孕妇、不满十四周岁的人或者七十周岁以上的人的；
。关于这个话题，safew官方下载提供了深入分析
understood by beginners and advanced users alike.
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