Abstract: The invention, which relates to a liquid-carrying roller for wet etching and a wet etching method, belongs to the technical field of solar cell manufacturing, and solves the problem of abnormal roller levelness in a process of manufacturing a solar cell in the prior art. The liquid-carrying roller for wet etching of the invention comprises a first end shaft, a second end shaft, and a liquid-carrying shaft, the first end shaft and the second end shaft being located at both ends of the liquid-carrying shaft, respectively, the first end shaft, the second end shaft and the liquid-carrying shaft being arranged concentrically, and the diameters of the first end shaft and the second end shaft being both adjustable.

Abstract: A user privacy data-based recommendation method includes sending a user preference tag to a cloud, where the user preference tag includes a first generalized tag obtained after a first tag generated based on privacy data of a user is generalized, receiving a plurality of resource items found by the cloud from a resource library based on the user preference tag, and selecting a recommended resource item from the plurality of resource items.