1、The supply of oil can be shut off unexpectedly at any time, and in any case, the oil wells will all run dry in thirty years or so at the present rate of use.
并列句。and连接两个并列的分句。第一个分句为简单的被动句,翻译时状语unexpectedly at any time前置。第二个分句中in any case为状语,主干为 the oil wells will all run dry,in thirty years or so 为时间状语,介词结构at the present rate of use也作状语,翻译时后两个状语均前置,译于主句前。
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