1、

Based on the analysis of the stress of movable blocks and the three patterns of block motion, a net sliding force is deduced as the theoretical basis for the identification of key blocks.

在分析了可动块体的受力情况和块体运动的3种模式的基础上,推导出了在3种运动模式下块体的净滑动力,从而为辨识关键块体提供了理论依据。

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2、
3、

So that was the reason why there were some books printed using movable type, but it never really replaced wood-block printing in the way it did in the West.

这就是为什么即使有些书是采用活版印刷,但是,活字印刷术从来没有象在欧洲一样代替木刻印刷术。

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