frozen 如何理解? 原文如下,含 frozen 的那句话该如何理解。 This specification is not retroactive. It shall apply to new installations and to major modifications or extensions of existing installations, both onshore and offshore. The scope of this specification is limited to highlighting layout considerations, and should not be considered as a substitute for: • The definition and extent of impacted area, restricted area and the partition into fire zones which is assumed to be frozen before layout is worked on. • The classification and extent of hazardous areas, which, in some extent, results from the selected layout options.查看更多4个回答 . 5人已关注