Implemented by user, no special support needed from operating system, programming design of overlay structure is complex.
由用户执行，不需要操作系统的特别支持，覆盖结构的程序设计很复杂。
This mirror complex and its support structure were expected to form the largest single fragment in what could have been a shower of some 30 pieces of debris to make it through to the surface.
这面镜子比较复杂，而且预计其支撑结构形成了最大的单一碎片，它在原本可能有30块的碎片雨中成功地追回地面。
The structure forms of catalyst support for tubular fixed bed reactor underwent the evolution from complex to simple and from difficult to easy.
列管式固定床反应器催化剂支托的结构形式，经历了由繁到简、由难到易的演变。
The structure forms of catalyst support for tubular fixed bed reactor underwent the evolution from complex to simple and from difficult to easy.
列管式固定床反应器催化剂支托的结构形式，经历了由繁到简、由难到易的演变。
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