If a man merely watches the limits of time and space, he will never step over the boundary of the paradigm of life.

如果一个人只看时间和空间的界限，他永远也不能跨越生命的框框的边界。

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By introducing the method of rotation operator, we study the singular limits for the boundary problem of rigid wall in hydrokinetics equations.

采用旋度算子的方法研究流体动力学方程组固壁边界问题的奇异极限。

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The ignition process of combustible gas stream by a heated plate in the laminar boundary layer was analytically considered and the limits of ignition were determined.

以此分析了炽热平板层流边界层内可燃气流的引燃，给出了描述引燃的着火临界条件。

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This limits the dangers of operating in old workings, he said, and creates a boundary between the old and new collieries.

BBC: Gleision Colliery near Cilybebyll: Brief history