2nd翻译活动的讨论.？ rollover(roll-over)指的是液化天然气的翻滚现象，产生的原因是液化天然气中的组分出现分层而造成部分组分迅速汽化，一般在运输过程中会发生 这段的翻译：note: relief valves are normally not sized to relieve vapors generated during “rollover.” although vapors generated during rollover are a source of potential overpressure, there are no generally recognized methods available for calculating the relieving requirements of these vapors. proper design and operation of the storage system are essential whenever an attempt is made to prevent rollover (see section 9 of api standard 2510). 安全阀的定型一般不考虑“翻滚现象”所产生蒸汽的排放。虽然这也是导致超压的原因之一，但目前还没有一个公认的方法来计算这部分气体的排放要求。罐体（句中为贮藏部分）的合理设计和操作是防止“翻滚现象”的根本。查看更多
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