A model of periodic ring-stiffened cylindrical shell was designed, and the experiment on the vibrational power flow from the model excited by an outer force was accomplished.

设计了周期加肋圆柱壳结构模型，对加肋圆柱壳受激振动的能量流进行了实验研究。

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Ripple on water results from pushing by outer force, such as wind or flow.

水面生波是因为风、水流等外物的推波助澜所造成的。

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The outer world of banter and irony, a healing or at least comforting force, gradually vanishes, as does Midge, their embodiment, leaving us with increasingly lonely images and sounds.

NPR: 'Hitchcock's Music' Scores Big on Suspense