Fixing mode: it is fixed by means of concealed screw and shaped part.

固定方式：采用暗式螺钉和异形件方式固定。

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Fixing mode: the fixing mode of plug-in part is adopted, and screw mode is not used.

固定方式：采用插接件固定方式，不得用螺钉方式。

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Typically as development moves into a sustaining maintenance mode, chance of success for bug-fixing or adding new features goes up.

通常随着开发进入到支持维护状态，修改缺陷和添加新功能的成功几率逐步提高。

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