在最初的项目设计阶段和试验性实现阶段中，我们遇到了与转向基于主题的、信息类型化内容开发有关的一些挑战。

In the initial project design stage and during the pilot implementation stage, we faced several challenges related to making the move to topic-based, information-typed content development.

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作者认同国际上普遍接受的观点：较其它类型的研究设计，随机对照试验对推断干预措施与效应的因果关联，其真实性最强。

The author identified with views that as compared with the research design of other types, RCTs is the most authentic one in the aspect of causality of efficacy and intervention.

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设计了不同类型的缺口试件，分别进行静态和疲劳试验。

Both static and fatigue tests are performed to specimens with different notched types.

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