The entry section shape and the reasonable design of inclined beam were determined according to the analysis of key blocks and the results of numerical simulation.

由关键块的分析和数值模拟结果，确定了综放沿空小断面留巷的断面形状，给出了斜梁的合理支护设计。

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In this paper, the module of this system is established, the system's dynamics is studied, and the frequency response of the key blocks in the system module is tested through experiment methods.

论文中首先建立了系统的数学模型，分析了系统动态特性，并通过实验方法辨识了系统数学模型主要模块的频响特征，作为建模过程验证以及控制算法设计依据。

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This type of play, especially with building blocks, helps children discover and develop key principles in math and geometry.

这种类型的游戏，尤其是积木游戏，可以帮助孩子们发现和发展数学和几何的关键原理。

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And in Scratch did you probably see the key word "and" on one of the blocks.

在Scratch中，你们大概看到那个关键字,“and“在其中一个程序块中。

哈佛公开课 - 计算机科学课程节选

"Big data is one of the key building blocks of the digital economy, " said Stephen Shurrock, chief commercial officer at Telefonica Digital.

BBC: Telefonica hopes 'big data' arm will revive fortunes

Sanctions imposed on Iran by the United Nations, the United States and the European Union were one of the key stumbling blocks.

CNN: Talks over Iran's nuclear program resume in Moscow

It permanently blocks a key enzyme on the surface of the flu virus, stopping it from spreading to other cells.

BBC: Flu drug 'shows promise' in overcoming resistance