environment variables, command-line argument parsing, reading and writing
第三十四条 自然保护区管理机构应当在确保生态得到保护的前提下，完善自然保护区公共服务体系，提升公共服务功能。自然保护区一般控制区可以划定适当区域，设置必要的辅助设施设备，为开展相关科学研究、科普宣传、生态旅游、教育文化体育等公共服务活动提供支持。
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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.