没有永远的东家，只有永远的 offer。
结论：在不确定性中构建非对称优势
。关于这个话题，爱思助手下载最新版本提供了深入分析
He connected them with a coastal walk veteran, who was "an absolute gold mine of information", sending them off with high-vis vests for road walking and a collection of maps.
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.