Shell explored quitting Europe and moving to the US
壳牌曾考虑退出欧洲并迁往美国

New boss part of executive review that discussed potential shift in effort to close value gap with American rivals
壳牌CEO萨万担心，壳牌与在美国上市的竞争对手埃克森美孚和雪佛龙之间的估值差距不断扩大。