This thesis USES theoretical approach, combining experiment method, to make an in-depth study on the pressure drop of filter-paper, clean and clogging pleated air cleaner products.

本文以理论研究为出发点，结合实验的方法，对滤纸、清洁褶状空气滤清器以及含尘褶状空气滤清器的阻力进行深入研究。

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Those who've chewed know that a decent amount of cake can be left behind in the carefully pleated paper, and chewing it can satiate the desire for a second cupcake.

NPR: How to Eat a Cupcake