您可以注意到，命令规范上有许多微小的差异和变化，但是各种技术最终聚合在相同的核心概念上。
You'll note numerous small differences and slight variations in the naming conventions, but the approaches have converged on the same core concepts.
这说明材料强度提高并不是聚合物发生化学反应造成的，一般这种变化在加热状态下是可逆的。
This suggests that the self-stiffening is not the result of chemical changes in the polymer, which can usually be undone by heat.
如果一个嵌套复合文档的简单子文档的内容在嵌套复合文档pdf生成之后发生了变化，那么变化的内容不会反映到聚合格式上。
If the content of a simple child document of a nested compound document changes after a nested compound document PDF has been generated, that content is not reflected in the aggregate rendition.
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