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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The shade is a new one since last night. Its Snow White paper is pleated in wave-like folds, and painted in one corner is a spray of blood-red gardenias.

那罩是昨晚新换的罩，雪白的纸，折出波浪纹的叠痕，一角还画出一枝猩红色的栀子。

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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